Lightweight and versatile enough to take and use anywhere! Use for sitting on a chair, on the floor, take in the car or place on floor and stand on to improve balance and coordination. Differently textured both sides, one small bumpy and the other spikey provides differing pressure and sensory feedback. Inflate for firmness and less movement or leave as is for greater movement. Available singly in Blue, Green, Orange & Purple or as a boxed set of 4. Box sets great for use as stepping stones for small or big kids alike to improve balance and coordination while having fun!