It Helps bring relief to most sitting pains, such as sciatica, herniated discs, tailbone injuries, pregnancy back pain, hip pain, hemorrhoids and other spinal issues. Soft & durable material conforms to your body for superior cushioning while resisting punctures and leaks. Hypoallergenic and machine washable providing you with a safe and clean cushion. Fast and easy inflation with the included air pump. With our included air pump, you will always be able to inflate your cushion quickly and easily. Great for car truck driver seat, office, home and kitchen chair, recliners, wheelchair, bed. Specification: Material: PVC Size: approx. Inner Diameter 7cm/ 2.8inch 9.5cm/ 3.7inch 11cm/ 4.3inch 13cm/ 5.1inch 15cm/ 5.9inch 16cm/ 6.3inch Package Includes: 1X Inflatable Donut Cushion 1X Air Pump (Random Style and Color) Note: Please allow 0-1cm error due to manual measurement, thanks.