• plastic
• teething -- for developing recognition in color and shape, hand eye coordination and imagination,stacking flower arrangement
• Stackable rings --can also be used as a teething tool, the material is safe, and it will not cause harm to the body,color sorting sensory
• Ring stacker --bright, design captures attention, stimulates their imagination, and stimulates cognitive thinking and flexibility,stacking
• Stacking --consists of geometric shapes in different colors, can put them together themselves, stacking
• Stack rings --simple in structure, easy to use, not easy to deform, you can use it with confidence,learning