Description: Inflatable Donut Seat Cushion, It is shaped like a ring cushion, offers quality cushioning, alleviating the pressure placed on the coccyx. Provides great lumbar support for office chair and other sitting areas.It is also the best donut pillow for hemorrhoids and related issues. Relieve pain for long sitting, hemorrhoids, bed sores, coccyx, pregnancy, child birth, perineal pain, pelvic floor pain, anal surgery, prostatitis, etc. Suitable for office chair, car seat, desk chair, airplane seat, rocking chairs, sitting chair and wheelchairs. Come with a Inflator(Random Style Color). Size Chart: Size: Approx. Inflatable Diameter 250mm Inner: 95 mm / 3.74 inch Outter: 220 mm / 8.66 inch 300mm Inner: 110 mm / 4.33 inch Outter: 280 mm / 11.02 inch 350mm Inner: 130 mm / 5.12 inch Outter: 310 mm / 12.21 inch 400mm Inner: 150 mm / 5.91 inch Outter: 360 mm / 14.17 inch 450mm Inner: 160 mm / 6.29 inch Outter: 380 mm / 14.96 inch Material: PVC Package Includes: 1 Piece Inflatable Donut Seat Cushion 1 Piece Inflator (Random Style Color) Note: 1.Please allow 1~3 cm error due to manual measurement, thanks. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, thank you.