Made of durable nylon: Our material is nylon plastic, not rubber. Hard and inelastic, light weight, corrosion resistance, good insulation, environmentally friendly materials. common daily necessities: This box of assorted round washers contains 500 pieces / 8 popular sizes including the most common and common sizes -M2 M2.5 M3 M4 M5 M6 M8 M10 Practical plastic storage box: pre-classified for quick identification and protection against loss. Very convenient to use. General Intended Use: Increase the contact area of the bolt or nut with the workpiece surface to prevent wear of the workpiece surface. Versatile Gasket: Widely used in various fields such as semiconductor, automotive, aerospace and interior decoration. Mainly used in electrical connections, household and commercial appliances, car, marine, generators, machinery and installations. Our products are made with the highest quality materials and are designed to provide you with the best possible user experience. We strive to ship out all orders within three days of purchase, and the estimated delivery time is 8-15 days. When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please dont hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it