Spiky on one side and bumpy on the other, so children can choose the type of tactile input that's right for them. This cushion provides active seating or balance training combined with tactile input that many children crave. Encourages wiggling, improves concentration and attention skills while encouraging them to stay in place. Soft tactile spikes and smooth bumps encourage exploration. Great fro children with attention deficit disorder and sensory processing issues. 13" diameter. Ages 4 and up.