The 5 unique play pieces of the Skip Hop Rocking Owl Stacker gives your little one plenty to do. With a rocking base and rattle beads in the head, there are also 3 rings in between. The green ring has a clear top with leaf-shaped rattle beads and the wings are made from rubber and are perfect for teething. The yellow ring has click clack links and doubles as a musical shaker.The stacker helps to develop hand-eye coordination and practice motor skills. It is also PVC and Phthalate free leaving you with peace of mind.