Neo Chrome Heavy Metal Shift Knob For 6 Speed Short Throw Shifter 10X1.25 for Mazda RX-8 Made from SOLID weapons grade 6061 aluminum. THESE KNOBS ARE NOT PAINTED. They are Neo-Chromed for a brilliant finish. 40mm (1 9/16") Diameter SUPER HEAVY &nbsp;knob weighs in at 11.8OZ Design feels super smooth and ROCK-solid.