Hydrogenated Nitrile Butadiene Rubber; With Twenty 7/32 x 1/16 Inch/ Twenty 1/4 x 1/16 Inch/ Twenty 6.8 x 1.9 Millimeter/ Twenty 5/16 x 1/16 Inch/ Twenty 7.8 x 1.9 Millimeter/ Twenty 8 x 2 Millimeter/ Twenty 8.8 x 1.9 Millimeter/ Fifteen 7/16 x 1/16 Inch/ Fifteen 7/16 x 3/32 Inch/ Fifteen 11 x 2 Millimeter/ Fifteen 12 x 2 Millimeter/ Ten 13.9 x 1.8 Millimeter/ Ten 14 x 2 Millimeter/ Ten 15 x 2 Millimeter/ Ten 17 x 2 Millimeter/ Ten 9/16 x 3/32 Inch/ Ten 11/16 x 1/16 Inch/ Ten 11/16 x 1/8 Inch O-Rings And Plastic Storage Case; Total Of 270 Pieces