The KRYTAC Enhanced Gear set comes complete with a bevel gear, spur gear, and sector gear. Each gear is made from a dense, hard, alloy and then heat treated for extra strength. Rockwell test figures on the KRYTAC Gear set show a much higher rating than airsoft industry norms. The spur gear is unique from others in that it features a very stiff spring on the long shaft to prevent any lateral movement while spinning. These gears are the OEM components in KRYTAC AEGs but they are also a good upgrade for other types of airsoft guns.