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Blank Sea Shells Single or Pair, Cast Resin Clam Shell Seashell Prop, Half Shell Prop, Lightweight Mermaid Shells, Costume Mermaid Bikini

RedNebulaStudiosShop  

Item highlights

  • Materials: Impact resistant urethane resin, Please read Item Details for full description
  • Made to order

Seller's description

These decorative sea shells are made from lightweight cast resin and would make the perfect props for your mermaid or other oceangoing creature costume! They may be attached to a mermaid bikini top, strung as part of a fancy sea-themed belt, attached as decoration on a mighty trident prop, or anything else you can imagine. They'd also make a lovely Camino de Santiago pilgrim keepsake.

You can choose between two sizes for these shells: 4.5" diameter (about 1.25" depth) and 5.5" diameter (about 2" depth). The shape is slightly different for each size, as you can see in the photographs.

Choose the option to buy two shells together for a discount per shell.

These shells may be worn in the water. (Please note, however, that the resin they are made from is NOT rated aquarium safe so they shouldn't be used as aquarium props.)

* * * * * * * * * * * * * *

CAST OPTIONS

You can choose from these options for the cast piece(s):

- Raw cast vs cleaned-up: A raw cast is straight out of the mold with minimal cleanup. There will be some flashing and the edges may be sharp. A raw cast will require you to do some sanding and cleanup before use. You can also choose the cleaned-up option, where we take care of removing all of the flashing and sanding the edges clean and smooth.

* * * * * * * * * * * * * *

This is a made-to-order piece, meaning that once I receive your order, you are added to my casting queue. The processing time (before shipping) for this item is 1-2 weeks.

* * * * * * * * * * * * * *

All of my resin props start out as a sculpture I created in oil-based clay. These shells have a lot of ridges and detail on the surface! I make a mold of the original using silicone rubber, and then cast it in impact-resistant resin. While I don't recommend treating it roughly, this stuff is very tough!

This blank prop comes just as you see it in the photos - a blank piece cast in resin. If you choose the cleanup option, I also remove any flashing from the molding process and sand the edges smooth. This is a do-it-yourself piece, meaning it's up to you to finish, paint, and assemble it however you'd like. I'm also available to answer questions, so please don't hesitate to send me a message.

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Item review

Why this review appears

All reviews are from verified buyers. This review is shown automatically based on factors like recency, whether it includes comments, your chosen language, and whether the rating reflects the typical experience with the shop.

Summarized by AI

Looks great Great quality Love it Well packaged Clear instructions Fast shipping

“Really nicely done shells! I'm painting them and making a mermaid shell bra out of them :)”

Willow

Oct 26, 2025

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Only 4 left and in 1 cart

Price:$17.60+

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Shipping & return policies
  • Returns
    Accepted within 30 days
  • Cost to ship
    $7.17 to United States, 43215.

Reviews for this item

What buyers say, summarized by AI: Looks great Great quality Love it Well packaged Clear instructions Fast shipping

4.2

We calculate this number using a recency-weighted average of all ratings, with a rating's value decreasing by half each year to best reflect the current experience.

(53 reviews)

4.1 Item quality
4.6 Shipping
3.6 Customer service
100% Buyers recommend
Filter by category
5 out of 5 stars 5 This item

Tiana Sep 1, 2026

These are SUCH high quality. The etching in them give it a perfect seashell look. Also very helpfully included was information on how to paint the prop. 10/10 this will be perfect for my dark siren costume!

Tiana Sep 1, 2026

5 out of 5 stars 5 This item

Willow Oct 26, 2025

Really nicely done shells! I'm painting them and making a mermaid shell bra out of them :)

Willow Oct 26, 2025

5 out of 5 stars 5 This item

Etsy buyer Jan 11, 2025

High quality, worth getting the smooth version — that will make it easier to craft with. Just amazing! Thank you so much.

Etsy buyer Jan 11, 2025

5 out of 5 stars 5 This item

Inactive account Oct 7, 2024

I love these shells! I've been making a pair of clamshell covered swimmable headphones for my mermaiding adventures. These shells were easy to shape with a heat gun, and they're the perfect size!

Inactive account Oct 7, 2024

Seller's description

Specifications

May include: Two large white seashells with a ribbed texture. The shells are held in a hand.

These decorative sea shells are made from lightweight cast resin and would make the perfect props for your mermaid or other oceangoing creature costume! They may be attached to a mermaid bikini top, strung as part of a fancy sea-themed belt, attached as decoration on a mighty trident prop, or anything else you can imagine. They'd also make a lovely Camino de Santiago pilgrim keepsake.

You can choose between two sizes for these shells: 4.5" diameter (about 1.25" depth) and 5.5" diameter (about 2" depth). The shape is slightly different for each size, as you can see in the photographs.

Choose the option to buy two shells together for a discount per shell.

These shells may be worn in the water. (Please note, however, that the resin they are made from is NOT rated aquarium safe so they shouldn't be used as aquarium props.)

* * * * * * * * * * * * * *

CAST OPTIONS

You can choose from these options for the cast piece(s):

- Raw cast vs cleaned-up: A raw cast is straight out of the mold with minimal cleanup. There will be some flashing and the edges may be sharp. A raw cast will require you to do some sanding and cleanup before use. You can also choose the cleaned-up option, where we take care of removing all of the flashing and sanding the edges clean and smooth.

* * * * * * * * * * * * * *

This is a made-to-order piece, meaning that once I receive your order, you are added to my casting queue. The processing time (before shipping) for this item is 1-2 weeks.

* * * * * * * * * * * * * *

All of my resin props start out as a sculpture I created in oil-based clay. These shells have a lot of ridges and detail on the surface! I make a mold of the original using silicone rubber, and then cast it in impact-resistant resin. While I don't recommend treating it roughly, this stuff is very tough!

This blank prop comes just as you see it in the photos - a blank piece cast in resin. If you choose the cleanup option, I also remove any flashing from the molding process and sand the edges smooth. This is a do-it-yourself piece, meaning it's up to you to finish, paint, and assemble it however you'd like. I'm also available to answer questions, so please don't hesitate to send me a message.

  • Made by
  • Materials
    Impact resistant urethane resin, Please read Item Details for full description

Delivery details and policies

  • Get it by
    Nov 4-16
  • Return policy
    Accepted within 30 days.
  • Ships from
    Maricopa, AZ
  • Cost to ship
    $7.17 to United States, 43215

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Meet your seller

RedNebulaStudiosShop
RedNebulaStudiosShop ·

Maricopa, Arizona

We calculate this number using a recency-weighted average of all ratings, with a rating's value decreasing by half each year to best reflect the current experience. 5.0
·
18.7k sales
·
12 years on Etsy
Sarrah Wilkinson Robbie Wilkinson
2 shop members

Smooth shipping Has a history of shipping on time with tracking.

Speedy replies Has a history of replying to messages quickly.

Rave reviews Average review rating is 4.8 or higher.

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Listed on Oct 24, 2026