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 D1500SP features a donut shaped Multi-Core Foam cushion, with multiple layers of varied density foam for better playing and improved feel. Its durable tripod includes Pearl's adjustable Shock Absorber post for outstanding support and balance, and out exclusive Lock/Spin System allows the cushion to be secured in place or free spinning