This is a new set of 4 current production viton valve stem seals for the Kawasaki KLX250 '94-on, KLX300 '94-on and KX250F '03-on. Viton has the highest temperature threshold and resistance to chemicals compared to all other seal materials and are offered here at a fraction of OEM cost. Containing 5% Teflon for reduced friction and wear. These are the best on the planet, satisfaction guranteed or your money back. Please contact me if you have any questions. Thanks for looking!