I've used perforated metal in the past. Looks nice & is smoother on one side than the other (from the holes punched thru) so make sure the smooth side is "in".
(It looks the same on either side, but you don't want a snake with abraded nose...) Sold in sheets (3' x 3' as I recall) for screen doors etc. in home improvement.
The holes are tiny, about 2 mm. I've seen this in white too, besides "metal" colors, & it's easy to cut (metal shears) & work with, very sturdy.
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