These ten Thera-Feel and Find Spheres look the same…yet each of the five non-bounce ball-shaped bags has a match. The secret is revealed by carefully feeling what is on the inside. Each of the five pairs also has a different weight so one can sequence the pairs from lightest to heaviest. Plenty of language opportunities around in describing how each ball-shaped bag feels or sounds. Fluff, gel, pellets, beads and balls fill the pairs. Intriguing, tactile challenge.