The Reaper features 3.250" friction diameter to lower rotational inertia over larger 3.500" clutch designs. EXTRA THICK PLATES FOR RIGIDITY AND HEAT SINK. COOLING VANES. MORE FRICTION SURFACE THAN MOST 2 DISC 3.500" CLUTCHES. BOLT-ON SPROCKET FOR TRUER ROTATION. HEAVY DUTY WORKS GREAT WITH ANIMAL AND WORLD FORMULA ENGINE WHERE RULES PERMIT. BILLET STEEL DRUM. ACTUAL COLOR BLACK. CAN BE USED ON 3/4" JACKSHAFT.