Lakeshore Learning OT PT See-Inside Sensory Activity, Developmental Balls Set of 4 Brand New Great tools for Physical Therapy and Occupational Therapy Children get a variety of sensory experiences as they roll, toss and bounce our see-through activity balls! All 4 balls are filled with objects of different colors, weights, shapes and sizes—from fun floating feathers to bouncing beads. Plus, each ball is made of flexible plastic that’s easy to grab—even for little hands! Balls inflate to up to 8" in diameter and require inflation upon arrival. (GAR)