MTI Racing's Blackhawk Delrin shift knob for Corvettes is used in our World Challenge Racecar. Delrin is a high-quality composite material that is ultra strong and can be machined to a precise tolerances. The Delrin material also resists heat, so the knob won't get hot in your hand. The MTI Racing Blackhawk shift knob is machined just like the grip of your fingers. It feels absolutely right!