ITEM NAME:270Pcs Rubber O Ring Metric Nitrile Washer Seals Pumps Assortment Kit 18 Sizes Product Description Description: Product Description Assortment O-Rings with convenient resealable plastic case Total 18 most popular used O-ring Sizes Hydrogenated Nitrile Butadiene Rubber (HNBR), also known as Highly Saturated Nitrile (HSN) is special class of nitrile rubber (NBR) and is for mission critical applications HNBR can be formulated to meet application temperatures ranging between -45 degrees C and 165 degrees C, and HNBR is classified by ASTM as DH-type polymer Material: Rubber Housing color: Purple Size types: 18 sizes (as picture show) Box size (L*W*H): 20.5x10.3x3cm Quantity: 1 set (270 pieces) Included: 1 x Set Rubber O Ring.Hydrogenated Nitrile Butadiene Rubber (HNBR), also known as Highly Saturated Nitrile (HSN) is special class of nitrile rubber (NBR) and is for mission critical applications. Included: 1 x Set Rubber O Ring.