METART-WW05-25103 represents the flat wire decorative mesh, which is made of 2.5mm flat wire with a 1.0mm wire thickness and a 3x3MM aperture size.
Just like most architectural decorative woven wires, this #25103 flat metal wire fabric is also mainly made of stainless steel wires, including SS304, SS201, and SS316.
If this architectural wire mesh panel has to be exposed in an outdoor environment, a 316 grade is always recommended as it is super corrosion-resistant.