Blue Bubble Shift Knob Manual Short Throw Gear Shifter Selector 4" 10X1.25 K61 for Mazda 3 Made from high grade acrylic THESE KNOBS ARE NOT PAINTED. Maintains color and shine for a long time to come. Weighted at 154g (5.4oz) for increased positive shift. Starts at 43.5mm (1.71") and tapers down to 34.2mm (1.34") at the base. This drift knob is 100mm (3.93" long)