RCV Series 30 CV joints are often used by Championship winning Pro4 teams because of their high strength and reliability. Now you can have the same durable joints for your rock crawler or buggy too. This 100% made in the USA version of the RCV Performance Ultimate Series 30 fixed CV Joint uses a housing, bearing cage and inner race manufactured from 300M aerospace alloy for strength. The housing, bearing cage & race have an isotropic finish for reduced friction. Joint is fitted with a 40 spline inner race. Backed by RCV's unbeatable "No Questions Asked Limited Lifetime Warranty".