Features18 different sizes， 125 pieces.The sealing ring is made ??of superior rubber.Variety of thickness and size are all in one box， very convenient to use.Heat-resisting， mineral oil-resisting， wear-resisting.Suitable for pipes， hydraulic， air， gas， and many other industrial applications.SpecificationsBox color: TransparentSealing ring color: BlackBox size: 21 x 10.5 x 3cm(L x W x H)ContentsM3.5*6=15 piecesM6*7.5=10 piecesM7.5*12=7 piecesM8*14=3 piecesM9.5*11.5=6 piecesM10*25=5 piecesM10*20=3 piecesM11.5*19=4 piecesM13*15=3 piecesM16*24=3 piecesM19.5*23=2 piecesM7=20 piecesM9=20 piecesM12=10 piecesM15=5 piecesM19=4 piecesM22=3 piecesM25=2 piecesPackage included1 box Sealing ring(125 pieces)