This is a new set of 16 current production viton valve stem seals for the Kawasaki ZX900 ZX-9R '94-'03. 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. Also containing 5% Teflon for reduced friction. These are the best on the planet, satisfaction guaranteed or your money back. Please contact me if you have any questions. Thanks for looking!