(silver) Bastens aluminum side mount heatsink fin fits 540 550 560 35mm brushed brushless 1/10 1/16 Traxxas 4x4 VXL Raptor Stampede Rustler Bandit Slash Summit Revo Losi XXX SCT Arrma FURY HPI BLITZ Included: one (1) heatsink 14 mm wide will drop your motor speed 10 degrees F Most heatsinks take too much space on the motor and block breather holes. This heatsink brings the heat our far away where it should be. Simply clip in place installation No messy wires or fans that break. Great for the wet muddy conditions that you submit your RC to.