Mason Medical Premier One Foam Cushion, 18" x 16" transcend battery The alternating pressure system is DSC260 The alternating pressure system is optimized for pressure redistribution for people with up to Stage IV pressure ulcer The Convo Gel cushion from Drive and Mason Medical is specifically designed to redistribute pressure to assist in the prevention of pressure ulcers while providing patient comfort by incorporating high density convoluted foam over and under a dual chamber gel bladder Warranty: 1 Year Limited The Premier One Foam wheelchair seat cushion from Drive and Mason Medical provides patient comfort and stability with a simple