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You never know when you might need some O-Rings, and this assortment set, which contains 32 sizes and 419 pieces, should cover just about all the applications you could possibly need whether it's faucets, high-pressure washers or various hardware. The special thing about these O-Rings is the material used to make them, Buna-nitrile is a specially formulated material that resists penetration with (70a durometer) and it's proven to endure the test of time with incredible durability. The standards are so high that this set manages comply with aerospace standards AS568A, and they all come in a convenient carrying hard case for storage and portability.