... have 65 brass(the brass proportion is 65%, the zinc proportion is 35% ), 80 brass(the brass proportions 80%, the zinc proportion is 20 ... 99.8%)feature: non-magnetism, and be able to bear the grind.Usage: filter electron beam and electron display screen, etc.Mesh ... (5%-15%)feature: non-magnetism, and be able to bear the grind and ache and alkali. mesh: 8mesh-400mesh/inch copper wire ...