This is the Robinson Racing Hardened 19 Tooth 48 Pitch Pinion Gear.
FEATURES: Constructed of hardened machined steelMay be used on motors with a 5mm shaft
Features:For: SCX24Material: plasticLed Color: Super Bright White with White Ring Led Inner and outer LED both can be turn on/off individually with 3rd channel from Remote ControlJR Connecter...