Iron Sealing Wire, Thread Seal, 98.4Ft Lead Seal Wire Roll, Two Shares, Widely Used for Water Electric Meters (Total Length: 30 Meters, 0.85mm Diameter)

items like this or labeled/sold as like water meter seal wirenearly 100 ft for $7 and... space marine scale/ trench crusade mini scale https://imgur.com/a/8MvIJ1F basically. wrap it tightly around a sharpie, or dowel to get it coil-y, and jobs a good'n

Sealing wire is similar/the same as the barbed wire for miniatures you can buy from the Army Painter and other companies. NO guarantee that the linked product is the right scale, you might need another diameter!