Gear Knob Cavernous Carbon (Matte finish) Nuke Performance universal gear knobs in real lightweight carbon and billet aluminum with hollow design. The Nuke Performance universal Gear Knobs, Cavernous Carbon, comes in three lengths and two finishes. All three lengths and both finishes are made of real high-quality carbon and billet and anodized aluminum. This is the lightest and most awesome universal gear knob on the market and fits many different applications thanks to the included thread inserts.  Real-Carbon Gear Knobs Available in 3 different sizes Made in Sweden Available in both glossy and matte finish Fits 4 different threads, all included