RPM gear covers for the Associated SC10, B4 & T4 are built to the highest RPM standards of quality, fit, and finish. RPM SC10, T4 & B4 gear covers are completely sealed, preventing even the smallest particles from entering the gears. The spur area of our gear cover has been slimmed down for the wing on a B4 to fit over without interference. They also come with two 4-40 SHCS mounting screws that eliminate the stock button head screws. This means easier access to the pinion & spur gears since the gear cover can be removed using a ball driver – no removing the tire to get to those tiny button head screws! Our gear covers also come with our oversized, soft plug for quick and easy access to the slipper adjustment nut for instant trackside adjustments. RPM SC10, B4 & T4 Gear Covers are built from our trademark blend of bulletproof nylons and carry our lifetime warranty against breakage. They are available in either blue or black to suite any individual’s taste.