Specifications: Material: 304 stainless steel Surface treatment: passivation Product specifications: M2.5 M3 M4 M5 M6 M8 List of packages: Gasket 50 * ( M2.5) Gasket 100 * (M3) Gasket 50 * (M4) Gasket 50 * (M5) 25 * Gasket (M6) 25 * Gasket (M8) Note: The actual color of the product may differ; of the photo due to the light. There may be a slight deviation in the measurement of the product.