Samix MST CFX-W 8mm Brass Hex Adapters help add a bit more unsprung weight, and add 8mm of length to your track width. The hubs weigh 6.5 grams each (26g total), so they add minimal rotating weight to the drivetrain. They are easy to install using the stock hardware and will help to increase the overall stability of the model.
Features: Brass hex adapter add 26g for 4 pieces Improved center of gravity 6mm thickness Made of high quality CNC machined brass Direct fit standard CFX-W Black coating to help prevent corrosion