1.Valve Core Material:Brass. 2.35MM Ceramic Cartridge 3.Certificate:ISO,CE 4.3 years Guarantee 5.Lifetime:50,0000 times. Detailed ... .5%-60%.2.35MM Ceramic Cartridge3.Certificate:ISO,CE 4.3 years Guarantee5.Lifetime:50,0000 times.7.EN817,ISO9000,GMC8 ...