1. Made of durable hard plastic, wear-resisting corrosion resistance.2. The flat washer provides a bearing surface for fastener load distribution or is used as a spacer between components.3. Provides resistance to abrasion, corrosion, and many chemicals and solvents. The material is a strong yet lightweight plastic and is non-conductive.Specifications:Material: PlasticThickness: 1mmInner Diameter: 3mmOuter Diameter: 6mmPackage Contents:200 x Flat Washers