This product is ring assortment, made of solid materials, safe and durable. It can serve you for a long time without being easily . The product is an excellent o ring assortment that can bring you more convenience, allowing you to have a more comfortable experience. Features -Color:Transparent -Material:Silicone -Size:3.00X3.00X0.20cm/1.18X1.18X0.08in Temperature range: -22 fahrenheit scale (-30 degree centigrade) to 392 fahrenheit scale (200 degree centigrade) - Widely used in hydraulic and pneumatic seals, pressure valves, gas compressors, reaction valves, heat , boilers, filters, mechanical seals. - Made with premium silicone material, -ring is wear-resistant, -resistant and anti-aging. - Comes with various diameters of flat washers, can meet your different needs in work. - A good substitute silicone grommet for your broken or worn out one. - Excellent craft, carefully down to every detail to give it and beautiful look. Package list: 450 rings