Here is a chunk of copper (without flanges) X-band (8.2-12.4 GHz) waveguide  WR-90, 23 or so inches long, I figure this is an excellent starting point for filters or making a slotted waveguide beacon antenna. Sadly, copper/brass WG is getting a bit harder to find these days, a lot went to scrap! Easy to solder and work! Because of its length, less than fun to ship. Have fun.

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