These are bright and colorful hard acrylic beads that come in assorted sizes, shapes and colors and are a wonderful addition to any bird toy. These are available in packets of 25 beads. Each individual bead varies in size from 5/16” in diameter up to ½” diameter with holes that vary from 1/8” up to ¼” for stringing. Mix and match them with other toy parts and your bird will have hours of fun with their new toy.