2mm hole size. The beads are 33mm or 1.25 inch long. Large enough for beading wire only.
5mm hole size. The beads are 25mm or 1 inch long. Chopstick sized hole.
7mm hole size. The beads are 19mm or .75 inch long. Pencil sized hole. The most popular size for your dreads. Yes, they are washable.
Custom hole-sizes are available up to 14mm or .50 inch in diameter. Anything wider is constructed differently and involves a higher price point. Please see jumbo fiber rings and scarf slides in my other fun shop, Softjewelry at http://www.etsy.com/shop/SoftJewelry
The beads in the photo are made from a skein of yarn and are a strong representation of the beads you will be buying. If you want to see the exact beads you are purchasing, contact me. I'll be very happy to take more photos! D39