ST-TW This is the genuine G.I. camouflage trip wire used by U.S. Forces in Vietnam. Its special matte finish 24 gauge steel wire does not reflect sunlight or moonlight. Ideal for any tripwire-activated device. Each spool contains four 38 ft. lengths of wire (two olive drab and two tan), for a total of 152 ft. Since this is U.S. military surplus from the Vietnam era, some may have a small amount of surface rust on the wire or small nicks in the wooden spools, but neither affects their use whatsoever.