This multi-pack of Amtech wire wool includes three grades: coarse, medium, and fine (4 of each grade). The coarse grade is ideal for removing rust from metal surfaces. The medium grade is perfect for restoring and polishing aluminium, brass, copper, and other metals. It is also effective for cleaning copper pipes and fittings before soldering or removing lacquer and varnish. The fine grade is suitable for burnishing wood and metal finishing, such as on brass, and for flattening painted or varnished surfaces before applying wax polish. Please note: This product is not suitable for use on plated surfaces.