The Mapex 400 Series Pedals features a single-chain design with round cams for a smooth feel. The P400TW Double Pedal feature a plate below each footboard, making this one of the most stable double pedals in this price range. Mapex 400 Series Pedals are the perfect choice for the beginning drummer, or a pro looking for great, value-priced hardware. Mapex 400 Series P400TW Double Bass Drum Pedal. For example, if your order is placed AND paid for at 1 p. Store Policies If you’re not satisfied, neither are we. Be in brand-new condition, showing no signs of wear or use such as belt-buckle or pick scratches, scuffs, dings, or scrapes on the instrument or collateral materials.