When thinking quality pro series clutch kit, think EPI. EPI has 30 + years of real-world manufacturing and engineering of pro series clutch kits. EPI takes a unique approach of testing their pro series clutch kits in a real-world riding environment to ensure their pro series clutch kit meets the requirements of our customers. EPI's pro series clutch kit are designed for 0-2000 feet elevation. They deliver bolt on performance for aggressive riders who like to be in the front of the pack. These clutch weights keep the engine operating at the correct RPM, keeping power on tap for when you need it.