This is a Hot Racing Ultimate Brass Weight Knuckle Portal Cover Set for the Traxxas TRX-4 Scale Crawler. Add weight to your crawler where it needs it - down low. Adds to each steering knuckle, If needed you can get the weight kit and add on some more weight.
Weight (each): 161g (5.68oz)
2x 72 g portal Gear Cover
4x 21g add on front weight
2x 47 g add on Back weight
Replaces part of factory plastic TRA8251
One stock covers weigh in at around 3 g / 0.1 oz