14in/35cm in diameter, large spiky dimples on one side (for standing), very small dimples on the reverse side (for sitting).
Free 6-inch hand pump included for easy inflation. Cushion is delivered deflated.
No instructional DVD; Presented in a nice COLOR box. Durable & safe: Made from EU approved phthalates free pvc & contain no heavy metal elements. Helps improve balance, coordination and flexibility; Good for active sitting, muscle strengthening, and joint stabilization.