Washer Gasket Assortment Set O-Ring MaterialNitrile Rubber (NBR). Matching O-ring Features: Anti-static, oil-resistant, heat-resistant, wear-resistant, durable and long service life. Wide application Widely used as sealing rings and washers for connectors in hydraulic machines, pipelines, etc. , bicycles, RVs, boats, pumps, furniture and more. Rubber washers meet your needs Soft and flexible rubber seal ring, simply snap-on, easy to install. This assortment can meet most plumbing, automotive and general repair needs. Package Included1200pcs rubber faucet washers with storage box. O-ring thickness: 1.5mm, 2.4mm, 3.1mm. Soft and flexible O-rings, simply snap-on, easy to install. Faucet Washer Kit Details6 x 1.5mm, 6.5 x 1.5mm, 7 x 1.5 mm, 8 x 1.5 mm, 9 x 1.5 mm, 10 x 1.5 mm, 11 x 1.5 mm, 12 x 1.5 mm, each size 100 pieces 13 x 1.5 mm, 14 x 1.5mm, 15x1.5mm, 16x1.5mm, each size 50pcs. 17 x 2.4mm, 18 x 2.4mm, 19 x 2.4mm, 20 x 2.4mm, 21 x 2.4mm, 22 x 2.4mm, 23 x 2.4mm, 24 x 2.4mm, each size 20pcs. 25 x 3.1mm, 26 x 3.1mm, 27 x 3.1mm, 28 x 3.1mm, each size 10pcs.