ObboMed SS-2750G 360&deg; Rotation Portable Swivel Seat Cushion with Non-Skid Plastic ABS Base and Washable Velour Cover, Easy Movement for Back, Hip, Tailbone Pain Suffers, 15&rdquo; x 2&rdquo;(Gray) Diameter of 38cm, fits most chairs at home or office Ball-bearing roller mechanism allows 360 turning without binding Durable & lightweight ABS base with slip-resistant bottom conforms to seat Removable and washable cover 3.5 cm/ 1.4 inches thick padded seat holds up to 130 kg/ 300 lbs * NOTE: This product doesnt fit properly for seat shape and seat size of general sports cars or vehicle seat with an uneven surface on both side. For car seat use, please check models: SS-2710 (Special Size For Car) or SS-2720 (Ultra-Thin) Ball-bearing roller mechanism allows easy movement; 360 smooth turning without binding. Reduce strain and stress on your back and hip while getting in and out of car seat. Non-skid plastic base is portable and lightweight. 1.4 inches / 3.5 cm thick padded seat can hold up to 300 lbs / 130 kg. Come with a washable velour cover for personal hygiene maintenance. Time-endurance home / office essentials for those who suffer tailbone, back, and hip injuries. 1 x Swivel Seat Cushion 1 x Color Box Dimensions: 15 x 2 inches / 38 x 5 cm ; Padding Thickness: 1.4 inches / 3.5 cm Max. Support Weight: 300 lbs / 130 kg Color: Gray Material: Velour, polyurethane foam, and ABS base Latex: No