Diameter - 11mm All Laser and Beam earrings are handmade from acrylic, though may include wood. All Laser and Beam earrings have surgical steel posts, so perfect for sensitive ears. Colour of acrylic can vary slightly from pictures to real life because of variations between screens & placement of glitter (if you’ve picked a set with glitter) may vary slightly for each pair secondary to the handmade nature of each item.