Mapex P400TW Double Bass Drum PedalDESCRIPTION: With standard features like single chain drives, adjustable spurs, and reversible beaters, the Storm P400 pedals provide solid performance and durability at a price thats perfect for younger players making their first step up pedal purchase. Whether its the single or double pedal version, the P400 gets beginners off on the right foot. FEATURES: The single chain drive mechanism provides extended durability compared to most beginner pedals.