Use this plastic0.8 MOD GearfromTiltawith your Nucleus-M FIZ motor for use with 0.8 MOD gear lenses. The gears on the Nucleus-M are interchangeable so they can be swapped out for different-size gears. Package contents:Tilta 0.8 MOD Gear for Nucleus-M FIZ MotorConstruction material: ABS plasticGear: Standard 0.8 MODWidth 0.4"/10mmWeight 0.9 oz / 25.9 g