This listing is for a set of 10 Blue & Black Rubber Spike Beads....Beads measure 8mm....The 8mm measurement comes from the internal base bead....The actual outer measurement of the bead is approximately 12mm to 15mm with 1.8mm hole....These fun, funky, brightly colored rubber beads are made from recycled materials...The soft, stretchy little porcupine spikes are just plain fun to touch...These beads are wildly popular in teen and young adult fashion....They look great as earrings, bracelets and body jewelry such as belly button rings or eyebrow rings....I do combine shipping....Please check out my store for more beads and hundreds of other great items....Thanks for looking.