Pearl Back Rest for Drum Throne D3500 or any D1500 DTBR-1535Roadster thrones now feature the option of adding a DTBR1535 Backrest. Following three years of exhaustive research and development, Pearls professional Roadster thrones have been updated to give drummers the right support where it is needed most. 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 Cores ergonomic design and the computer tempered surface