Product Description: Overall dimensions/cm (large): 16 × 15 × 17, quantity 2 pcs External dimension/cm (medium): 16×15×15, quantity 2 pcs. Overall size/cm (small): 16×15×12, quantity 2 pcs. Suitable for paraplegics to move on the cushion, after supporting with both hands, it is favorable to raise the arm for moving on the cushion.