Here’s a vibrant stack-and-discover experience! The top of each cup features a squishy food-grade silicone bubble embossed with a unique texture pattern. Little fingers love to feel, push and pop the bubbles again and again! Then they take the sensory play to a whole new level—as they stack, nest and arrange the cups any way they want. The set includes 5 BPA-free nylon-plastic cups in 5 colors and sizes; largest cup measures 7 3/4" in diameter.