These shift knobs are designed to fit the 6 speed right out of the box. Each knob is machined from Delrin/Duracon, an extremely durable thermoplastic. Each knob weighs 120g, a fraction of it's Stainless Steel counterpart. Each shift knob also receives laser etched GrimmSpeed logos around the base. The shift knob itself features a hybrid design that is comfortable in both overhand, and side grip driving styles.