Inflatable Natural Medical Nylon PVC Ring Cushion With air pump Size: Outer diameter: 40cm Inner diameter: 10cm Cushion height when inflated: 60mm colour: Blue Air cushion is designed with more human body in mind for patient who are at intensely high risk from pressure sores Or Assist With Healing. Can Be Easily Wiped Clean. Helps Increase The Comfort Of Sitting For Lengthy Periods In One Place. The Surface Of The Ring Is Lightly Patterned To Prevent Slipping Features: Conforms to your body's contours Helps relieve pain and discomfort associated with hemorrhoids and other post operative pain Designed for patients who are a high risk of pressure sores Made from durable rubber for long life Amazing valve designed for easy inflation Easily inflate to your custom level of firmness.