Meanwhile, its unique stackability engages curious and growing minds while providing the hours of fun parents have come to expect from the entire line of Dimpl toys. Tactile fascination stacks up with Dimpl stack!   Dimpl Stack  Set of stacking cups with textured silicone bubbles Encourages fine motor skills, spatial reasoning, sensory learning, tactile exploration Silicone bubbles embossed with unique textures - fun to feel, push, and pop Stack the cups from big to small, nest from small to big   Vibrant colors thrill the eyes!  Includes 5 Dimpl stacking cups  Bubbles made of 100% food-grade silicone  Bases made of high-quality nylon-plastic  BPA-free - fully safety tested  High-quality materials and construction - lasting durability