The Exotek B6.3 Brass Weight C Block is a stealthy black coated brass C block hanger option for the Associated B6.1-B6.3 series buggies with 73mm arms. Not for use with the B6.2 75mm arms. The block weighs 24gr and helps increase rear traction by adding weight at a low point under the gearbox. Laser etched for easy identification.