Description Grooved Supercharger belt pulley machined from 6061 Aluminum and hard coat anodized that is a stock replacement for the Hellcat, Charger, Demon and Trackhawk with supercharged engines. The size of the stock pulley is 2.85”. The TBA machine pulley is 3″ which is slightly oversized but still allows the use of the original belt when installed and aids in additional belt wrap for the supercharger. Each pulley has two severe load 18,000 rpm bearings installed for a lifetime of use. Not only will it dress up your engine compartment! The stock pulley weighs 26.4 oz (1Lb 10.4oz). The TBA Machine pulley weighs 10.3 oz so your supercharger will benefit from the more than 1 lb of less rotating weight.