Tabletop-Art has some new barbed wire you can use on your minis and terrain pieces.
From the release:
The wire is an imitation of barbed wire, is not sharp and has no real spikes.
The version of “standard” is excellent for miniatures and terrain with a scale of 28mm and 30mm, the version of “thin” is excellent for a scale of 20mm and 15mm. Both Versions are available in 6m or 12m. Material: iron, galvanized.
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