Red Glow In The Dark Shift Knob For Manual Short Throw Gear Shifter 12X1.25 K15 for Ford Mustang These knobs are NOT painted. The color will NEVER rub off or lose its shine! NO SET SCREWS! All-metal threads so your shift knob WON'T wobble or fall off. Perfectly sized at 2 1/8" diameter, the 4oz design feels ROCK-solid in your hand. Made in the USA. Sickspeed is proud to be America based, and American owned! Features a Glow in the dark design, just charge them up in light and they will glow for hours.