Essential for extended and efficient performance, Pearl Roadster thrones feature advanced ergonomic design and a selection of computer-tempered cushion tops to provide support and ease joint pressure during long sessions. The D1500RGL features a Round Multi-Core Foam cushion, with multiple layers of varied density foam for better playing  and improved feel. It is adaptable to Pearl's optional DTBR1535 breathable backrest, and the unique Aluminum Strut design of the Gas Lift tripod gives solid support and lightweight, easily adaptable transport. The difference lies in each Multi-Core throne top. Using multiple layers of varied density foam that wrap around the surface of the cushion, Multi-Core’s ergonomic design and computer-tempered surface provides support to ease joint pressure during long sessions. Round Cushion 15 diameter round cushion consisting of Multi-Core stacked variable density foam provides superior comfort and support. Gas Lift Height Adjustment The Gas Lift Height Adjustment System provides quick, easy and smooth height adjustment from 495 - 695mm (19.5 - 27.4). Lightweight Aluminum Struts The unique Aluminum Strut design of the Gas Lift tripod gives solid support and lightweight, easily adaptable transport. CUSHION 15 Diameter Round Cushion. BACKREST Accepts Optional DTBR-1535 Backrest. HEIGHT RANGE Gas Lift Height Adjustment 495 - 695mm (19.5 - 27.4) WARRANTY: Limited Lifetime Gas Lift: One (1) Year