With standard features like single-chain drives, adjustable spurs, reversible beaters and solid base plates the Storm P400 pedals provide solid performance and durability at a price that s perfect for younger players makingtheir first step-up pedal purchase. Whether it s the single or double-pedal version, the P400 gets beginners off on the right foot. The single-chain drive mechanism provides extended durability compared to most beginnerpedals. Mapex Storm Single Chain Single Bass Drum Pedal The single-chain drive mechanism provides extended durability compared to most beginner pedals. Includes 1 year warranty.