Cosmic Crunch toys are made of 100% pulverized sea shells that provide caluium as they chew. They help to keep beaks and nails manicured as they play. Most toys have glow in the dark beads. with an afterglow of 20 minutes. The toys last a long time. the material is so hard that they acually shave away at the material instead of chew it. This toy is designed medium to large birds.