Really cleans up the look of your bike! 9 intensely bright LEDs in a cluster module for light output, amazing for it's size! All parts are fully CNC-machined from 6061-T6 billet aluminum May be rotated into virtually any upward-and-downward setting About 1" in diameter, roughly 3/4" (19mm) dia. at the light source, 2-3/8" long, and stand off the bike 1-1/2"