These are stronger valve springs made by PAC Racing Springs for the Kawasaki FE290/FE350 engine found in 1992-2005 Club Car and EZGO golf carts. The factory springs are 11 pound seat pressure, which allows for potentially destructive valve float above 3,800RPM. These springs, with 32 pound seat pressure, allow for much improved valve control up to 7,000RPM. Sold as a pair.