150 lbs./in. Spring Rate 10" Tall Coil Over Shock Springs - Black (Pair) Speedmaster alternator pulleys are manufactured

Speedmaster alternator pulleys are manufactured from quality materials to ensure strength and durability

stainless steel alloy and are carefully designed to increase gas flow for more power

2 SFI Approved and will withstand the extreme power and rpm of your performance application

but have profiled counterweights for less weight

150 lbs./in. Spring Rate 10" Tall Coil Over Shock Springs - Black (Pair) Speedmaster alternator pulleys are manufacturedSpeedmaster coil springs are designed to withstand the high stress levels of modern suspensions. They're manufactured from high quality chrome silicone steel, heat treated and shot peened, and then powdercoated or plated for protection and appearance.