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: -30°C to +120°C metric sizes from 3 to 50 mm For use in pipelines, machinery, engines, hydraulics, plumbing, and pneumatic machines Product Description - resistant to acid, gasoline, heat, and oil - made of NBR, not suitable for drinking water - includes the following: O-rings - 20 pcs. Ø 3 mm, thickness 1.5 mm - 20 pcs. Ø 4.5 mm, thickness 2 mm - 18 pcs. Ø 18 mm, thickness 2 mm - 23 pcs. Ø 7 mm, thickness 1.5 mm - 23 pcs. Ø 10 mm, thickness 1.5 mm - 23 pcs. Ø 13 mm, thickness 1.5 mm - 14 pcs. Ø 10 mm, thickness 2.5 mm - 13 pcs. Ø 11 mm, thickness 2.5 mm - 14 pcs. Ø 13 mm, thickness 2.5 mm - 13 pcs. Ø 14 mm, thickness 2.5 mm - 14 pcs. Ø 16 mm, thickness 2.5 mm - 14 pcs. Ø 18 mm, thickness 2.5 mm - 13 pcs. Ø 19 mm, thickness 2.5 mm - 14 pcs. Ø 21 mm, thickness 2.5 mm - 13 pcs. Ø 22 mm, thickness 2.5 mm - 10 pcs. Ø 18 mm, thickness 3.5 mm