These stacking and nesting cups feature silicone bubbles that can be pushed and popped, providing tactile stimulation for sensory exploration. The push-and-pop action and cup stacking help develop fine motor skills in young children. Designed for ages 6 months and up, the set encourages cause-and-effect learning while keeping small hands engaged. The five cups can be stacked from largest to smallest or nested from smallest to largest, with a lightweight design that's easy for little hands to grasp. Constructed from durable ABS plastic and 100% food-grade silicone, the toy is BPA-free for safe play. The squishy bubble elements add a fidget-friendly dimension to the stacking activity.