GRAND PRIX Starting Block w/ 4 Adjustable Positions Best selling track & field starting block. 5" Wide Pedals. Pedal pad let's the shoe flex, expand and contract with your feet for maximum push-off. Four Adjustable Positions. Customize degree angle to fit your torso and hip height to get maximum push off. Light weight aluminum construction. Perfect block to develop, refine, and improve your speed. The Grand Prix of track & field starting blocks decades on. America's Number 1 Selling Track & Field Starting Block.