There are total 50 pieces of silicone rings in one set that you may use for many projects. They are made of silicone and rubber materials for long service life, durable to use. They are specially designed for fastener, plugs, water and hydraulic fittings. Feature - Color: White - Material: silicone and rubber - Size: About 2.9x 2.9x 0.3 cm. - These washer rings are made of silicone and rubber materials for long service life, durable to use. - The washers are resistant to heat, chemical attacks and fungus attacks, they can provide a better seal and help prevent water leaks. - They are specially designed for fastener, plugs, water and hydraulic fittings. - They are perfect for automobile repair, electrical appliance and other fields. - Compact size and light weight, easy for storage and use.