This is NEMA17 42 Stepping Motor Cork Damping Gasket 2/3mm from the category 3D Printer | Absorber.Nema 17 Stepper Damper is the model number.Cork sheet, 42 mm x 42 mm, material3mm and 2mm of thicknessIncludes a 142 stepping motor in the package.Note: Import Dukan Purchase Directly From Manufacturer..