These are The Yeah Racing Traxxas TRX-4M Brass Hex Adapters. These optional hex adapters were constructed from high quality brass and are a great way to add unsprung weight to lower the center of gravity and increase the durability of your TRX-4M.

Features:

• Perfect fit for the TRX-4M
• High quality brass
• 5mm Thick

Includes:

• (4) 5mm Brass Hex Adapters