STR Fork Bleeders are the best available for removing excess air. Helps prevent excess air buildup & fork seal blow out. Forks should only be bled with bike elevated & front wheel unloaded. Silver, Black, Blue, or Red. Fits all '12-'18 RR 2-stroke / 2015-'18 RS/RR-S 4-stroke (except 125 RR-S) / 2019+ 2T & 4T Race Editions. Will not fit 2019+ RR/RR-S Standard Editions.