This product is legal in California only for racing vehicles which may never be used, registered or licensed for use upon a highway.
Feuling Econo Beehive Valve Spring Kit For Harley 
Feuling Econo performance Beehive valve springs are designed to handle up to 585 lift camshafts at an economical price. These Feuling Beehive springs are made from the same premium stress relieved conical ovate wire as our High Load springs but are developed for economical engine budgets. They have an excellent level of fatigue life and are designed to handle the demands of performance engines with 585 and smaller lift camshafts. Beehive valve springs use a much smaller and lighter weight retainer which drastically reduces the valve weight creating a much quicker revving and smoother motion than comparable dual valve springs. Dyno proven and track tested.
Features:

Allow up to 585 lift cams

No rocker box clearancing required

Eliminate valve spring separation, maximize stability, reduce valve-train noise & harmonics

Don’t get stung by inferior valve springs

Quicker revving

Smoother motion

Made in the U.S.A.
Kits include valve springs, lightweight steel retainers, machined heat treated chrome moly spring seats, seat shims, valve locks and a set of premium Viton valve seals equipped with a spring loaded valve stem wiper system.