Brand New Professional Quality 419pc Metric O-Ring Assortment 32 Metric Sizes Range From 3mm ID To 50mm ID Buna-N Material Is Oil Proof And Passes ASTM Oil #1 And #3 Laboratory Tests For Use In Transmissions, Plumbing, Hydraulics, Air, And Gas Connections Set Comes Complete In Red Storage Case Please See Additional Photos For The Complete List Of Sizes And Quantities In This Set