"Second purchase. I got the 8g/8mm with 4mm balls, forgetting I had already bought the 4mm replacement balls in my previous order to test how they fit and found them a tad too small. They don't quite sit flush against the post, but feel like they do thread on securely so I guess it's mainly an aesthetic thing. Obviously this is not an issue with the product, just a reminder to double check things, get replacements in another size or ask for pictures if you're unsure.
Always good to have some backups anyway, I bought the spikes too and Olivia has sent a bunch of spares as extras so I can always switch things up. Such a good variety of size and customization options, flawless quality."
NON-ANODIZED (3G, 4G, 5G, 6G, 7G, 8G, 10G, 12G) ASTM F136 Titanium Internally Threaded Bigger Gauge Horseshoe Circular Barbell Balls Spikes