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.
Instruction: Insert the needle of the pump into the tiny hole for inflation; Insert the needle only without the body of the pump into the hole for deflation. Find the hole on the 4th outer ring--One spiky dimple is replaced by that tiny hole.
Seller Warranty: Should pump be faulty or cushion defective, please 'Contact Seller' directly (other than Amazon Customer Service) from Amazon Buyer Central against your order for a replacement or refund. Seller aims to provide hassle-free after-sales service and usually replies most emails in 12 hours.