Package Include -- Taper Spring x 20pcs Material -- 304 Stainless Steel, anti-corrosion, not easy to rust, durable, reusable for a long service time. Specification -- Wire Diameter x Small Diameter - Large Diameter x Height Size -- [0.8x12-20x30mm] Various Application -- Widely used for Home repair and tool replacement, DIY project, electronic product, toys, industry, machinery and so on.