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These are spiral wound springs using 4- 8 pieces per set made fromheat treated high carbon steel and come in various shapes and sizesdelivering differing spring tensions depending on the size of the bikeand the horsepower of your engine. It is important to note that youcannot change the basic shape of these springs to gain any performanceadvantage but what you CAN do is buy a EBC Brakes CSK kit which haveslightly thicker winding material and deliver 10-15% more clamppressure.