... -Ring V-Ring.R-Ring. Y-Ring.U-Ring., Oil Seal,PU oil seals , rubber flat washers, rubber Circles, Gaskets, engine ... as per client's requirement.6. Colour: red ,white,black ,blue ,yellow,green ,brown ,etc.7. Standard:AS568,DIN3771,JIS B2401 ... o-ring's mold fee is free. KTW standard rubber seal