A set of soft rubber stacking balls, each filled with water, comes in a window box and is designed for infants and toddlers aged 0 to 3 years. This 72-piece bulk pack offers a tactile, sensory play experience that encourages early logic and puzzle skills through stacking and sorting activities. Each ball measures 21.5 centimeters, making them easy for small hands to grasp and manipulate. This product is sold wholesale by the box. Options: Educational, 21.5 cm.