Progressing pressure as RPMs increase. One piece hard anodized billet pressure plate guarantees no flex and optimal durability. Hard anodized for optimal durability. Multiple spring sets for optimal tuning. Weighted arms apply progressive pressure as RPMs increase. Two sets of chrome silicon heat-treated and preset no sag springs are included for different pressure options. Pressure plate works great with O.E. clutches. Easy bolt-on installation. Fits under O.E. primary cover and is available for cable and hydraulic applications. Made in the USA.