GPtoys S920 Parts Upgrade Metal Differential+Metal Reduction Gear+Bevel Gear
$34.99
The gear is made of steel and has been blackened and hardened. The hardness is harder than that of the zinc powder alloy gear, and it is more wear-resistant
The gear is made of steel and has been blackened and hardened. The hardness is harder than that of the zinc powder alloy gear, and it is more wear-resistant