O-Ring Assortment Metric Material Buna N Number of Pieces 385 Number of Sizes 30 Durometer 90 Shore A Hardness Very Hard Sizes Included 2mm C/S (16) Each of 3mm 4mm 5mm 6mm 7mm 8mm 10mm 2.5mm C/S (13) Each of 10mm 11mm 12mm 14mm 16mm 17mm 19mm 3mm C/S (12) Each of 20mm 22mm 24mm 25mm 27mm 28mm 30mm 32mm 33mm 35mm 36mm 38mm (11) 9mm 4mm C/S (9) Each of 38mm 41mm 44mm Case Type Plastic Box with Lid Chart Meets/Exceeds ASTM D2000 SAE J200