O-rings are made of nitrile rubber (NBR). provides excellent resistance to acid, gasoline, oil, UV and heat Can be used in the temperature range: -30C to +120C metric sizes from 3 to 50mm For use in pipes, machinery, motors, hydraulics, plumbing and pneumatic machinery Product description - resistant to acid, gasoline, heat and oil - made of NBR, not suitable for drinking water - includes the following: O-rings - 20 pcs. 3 mm, thickness 1.5 mm - 20 pcs. 4.5 mm, thickness 2 mm - 18 pcs. 18 mm, thickness 2 mm - 23 pcs. 7 mm, thickness 1.5 mm - 23 pcs. 10 mm, thickness 1.5 mm - 23 pcs. 13 mm, thickness 1.5 mm - 14 pcs. 10 mm, thickness 2.5 mm - 13 pcs. 11 mm, thickness 2.5 mm - 14 pcs. 13 mm, thickness 2.5 mm - 13 pcs. 14 mm, thickness 2.5 mm - 14 pcs. 16 mm, thickness 2.5 mm - 14 pcs. 18 mm, thickness 2.5 mm - 13 pcs. 19 mm, thickness 2.5 mm - 14 pcs. 21 mm, thickness 2.5 mm - 13 pcs. 22 mm, thickness 2.5 mm - 10 pcs. 18 mm, thickness 3.5 mm - 10 pcs. 20 mm, thickness 3.5 mm - 10 pcs. 22 mm, thickness 3.5 mm - 10 pcs. 23.5 mm, thickness 3.5 mm - 10 pcs. 25 mm, thickness 3.5 mm - 10 pcs. 26.5 mm, thickness 3.5 mm - 10 pcs. 28 mm, thickness 3.5 mm - 10 pcs. 30 mm, thickness 3.5 mm - 10 pcs. 31 mm, thickness 3.5 mm - 10 pcs. 33 mm, thickness 3.5 mm - 10 pcs. 34.5 mm, thickness 3.5 mm - 10 pcs. 36 mm, thickness 3.5 mm - 10 pcs. 38 mm, thickness 3.5 mm - 10 pcs. 41 mm, thickness 3.5 mm - 10 pcs. 44 mm, thickness 3.5 mm - 10 pcs. 47 mm, thickness 3.5 mm - 10 pcs. 50mm, thickness 3.5mm