The Gibraltar Strap Drive Single Bass Drum Pedal uses a Kevlar non-stretch strap drive system for solid, dependable action. Features a new “G” style pedal board design dual surface beater, adjustable spring tension, and a lightweight, sturdy frame. Velocity Strap Drive Double Pedal. Kevlar non-stretch strap drive system for solid, dependable action. New “G” style pedal board design. Thank you for shopping with us!