Here is some more info. from the invoice for the nickel meshes, from Inada Kanaami, Inc. It says:
ニッケル200 綾織金網 0.055Ｘ180mesh 200X300 5枚 Let me insert commas. That means: Nickel 200, twill wire mesh, 0.055 x 180 mesh, 200 x 300, 5 sheets Nickel-200 is 99.6% nickel. It is described here: https://www.magellanmetals.com/nickel-200
