Hot Racing Brass Heavy Metal Knuckle Weight TRX4 for the Traxxas TRX-4 Add weight to your crawler where it needs it - down low. Adds about 76g (2.7oz) to each steering knuckle. FEATURES: - CNC machined solid brass - Heavy to add weight to vehicle for greater stability. - improve weight distribution for better performance - Direct fit to factory plastic steering knuckles Portal and TRXF21C01 . YOU WILL RECEIVE: - Two (2) Brass Heavy Metal Knuckle Weight. SPECIFICATIONS: - height: - weight 76g (2.7oz) each REQUIREMENTS: - Recommended to use a removable-type locking adhesive on screws threading into metal COMMENTS: -Do not work with Hot Racing TRXF21HC