RC hobbyists, listen up! If you're running an HSP 1/10 scale car like the 94123, 94111, 94188, or similar models, this metal differential gear is a solid upgrade from stock plastic parts. Why metal? Because it's tougher, lasts longer, and handles more power without stripping. The gear measures about 45mm long and 38mm in diameter, and it's made to fit perfectly into your car's drivetrain. Installing it can improve your RC's performance, especially if you've upgraded the motor or drive on rough terrain. It's brand new, comes in a single piece, and is compatible with a bunch of HSP models (check the list to make sure it fits yours). Whether you're bashing, racing, or just want a more durable part, this metal diff gear is a smart move. Just make sure to use the right grease during installation. Keep your RC running smooth and strong!