These are the Replacement Timing Pulleys for the Street Force GP. These pulleys are mounted on the Center Pulley Shaft and the 2-Speed Shaft. FEATURES: Tough Plastic Construction White in Color INCLUDES: Four White 18T Timing Pulleys Four Side Caps COMMENTS: These are held on the shaft by a 2X10mm pin (DTXC8310). jim 6/14/00 ir/jl