Gibraltar 4711ST-DB Velocity Strap Drive Double Bass Drum Pedal. The 4000 Series Strap Drive single bass drum pedal is a simple and fast pedal, styled with the Wave pedal board and hammer dual surface beater this pedals delivers speed and ease of use. Has an all new "G" style pedal board design. The Gibraltar Strap Drive Single Bass Drum Pedal uses a Kevlar non-stretch strap drive system for solid, dependable action. A wave pedal board design helps keep your foot in place. Features a dual surface beater, adjustable spring tension, and a lightweight, sturdy powder coated frame.