13.5in / 34cm in diameter, large spiky dimples on one side (for standing), very small dimples on the reverse side (for sitting). It helps promote core stability, also a wiggle seat provides sensory input for kids.
Free 6-inch hand pump included for easy inflation.
Cushion is delivered deflated. No instructional DVD. Presented in a nice COLOR box.
Lab tested, conforms to the toy safety requirements, durable and safe.
Instruction: To inflate, the pin from the pump must break through the valve to reach inside of the cushion, or the pin hole would be BLOCKED by the valve wall preventing air to enter. To release the air from the cushion, just insert the pin without the barrel of the pump. Find the valve in the cushion on the 4th outer ring–one spiky dimple is replaced by the valve inside of a small hole.