Please add lubricating oil, it can be reduce the friction between the metal gears, also the sound will be smaller when it is running.

The gear set compatible with Traxxas Slash 2WD Stampede 2WD Rustler 2WD Bandit 2WD 1/10 RC car
The slash 2wd gears made of high quality steel,durable and lasting-performance.
Easy to install,a great replacement part for the old or broken one.
Nice upgrade part to modify your RC model car.

Materal:Steel
Motor Pinion Gear:
Teeth: 19T & 21T
Hole Diameter:3.17mm
Heigth:10mm

Spur Gear:
Teeth: 86T
Gear Diameter:41.5mm
Hole Diameter:11mm
Height: 11mm

Package Includes:
1 x 86T Spur Gear
1 x 19T Pinion
1 x 21T Pinion