Nitrile Rubber (NBR), 270pcs, 18 popular sizes. 1 X 270Pcs 18 Sizes O-ring Kit. 【Kids & Baby】. 【Fashion Jewelry】. 【Health & Beauty】. -Hydrogenated Nitrile Butadiene (HNBR), also known as Highly Saturated Nitrile (HSN) is a special class of nitrile rubber (NBR) and is for mission critical applications.
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