Each strand on this toy holds 16 colorful blocks made from varying types of wood. Some are hard, some are soft, but all of them are irresistible to wood-chewers. The metal chains are supported by a hollow tube of bamboo, and can be re-strung once all of the wood has been destroyed. Birds will also like the metal bells that hang in the middle of the toy. The wooden blocks on this toy are large so we recommend this toy only for large birds and very heavy chewers. A Moluccan Cockatoo and anything larger would appreciate this toy.