Silicone Stacker - Koala is a teether, puzzle and sensory toy all in one. A cute koala sits atop five differently textured, stackable teething rings of graduating sizes. The soft, food-grade silicone rings are easy for little hands to grasp and designed to soothe and comfort sore gums. Toddlers can develop hand-eye coordination and fine motor skills by stacking the Koala tower in different combinations.