The Sport + range of spares provides everything you need to fine tune a Scalextric car to get the maximum performance from it on the track. These Sport + pinion gears are suitable for use with most Scalextric FF motors (18,000 rpm) as well as the red C8424 (20,000 rpm), green C8425 (25,000 rpm) and black C8426 (30,000 rpm) replacement FF motors. Contains 8, 9, 10, 11 and 12 tooth gears.