Material: our stacking ring toy made of high-quality material is soft and non-toxic. They have a good soft and chewableno and edge. You don't have to worry when your children play with it and bite it, perfect to use as a teething toy. Puzzle building blocks toy: this stacking tower for stacking game to satisfy the baby's curiosity and tactile experience, help your baby learning. Mosaic design with concave-convex shape, can train baby's hand coordination and fine hand movements and strengthen baby's shape recognition, six different sizes promote the ability of the baby, the size of objects. to distinguish the ability to master spatial order, stable to stack and multiple early education awareness A set has 1 x koala + 6 x layers of soft rubber ring, satisfy the baby's daily play, squeeze teething baby toy. There is a small hole at the bottom of each soft circle, a squeaking sound sounds when children press the soft stacking rings. and improve baby's sensitivity. Teething rings: stacking toy with rings. It can be used to heal the baby's oral pleasure period. It is full of elasticity and does not harm mouth and teeth. It can relieve the discomfort of the baby when teething.