Mapex P810TW Armory Response Drive Double Bass Drum Pedals. 800 Series is a complete line of gig-quality hardware featuring heavy-duty tubes, double-braced legs, memory locks, and the adjustability needed by the serious player. The double chain creates a more solid feel and great durability. Solid Steel Base Plate and Retractable Floor Spikes. Drive: Double Chain Response Drive. Beater: Falcon Beater with 10g and 20g Weights. Extended Footboard Length: YES. Self-Adjusting Hoop Clamp: YES. With Easy-Access Side-Mounted Adjuster. Item dimensions L x W x H: 17.3 x 12.6 x 8.3 inches. Condition is brand new.