Strand structure Single strand. Simple and light duty structure with single line wire (also known as strand wire) and barbs. Double strand. Conventional structure with double strand wire (line wire) and barbs. ? Barbed structure Single barb. Also known as 2-point barbed wire. It uses single barb wire twisted on the line wire (strand wire). Double barb. Also known as 4-point barbed wire. Two barb wires twisted on the line wire (stand wire). Twist type Conventional twist. The strand wire (line wire) are twisted in single direction, which is also known as traditional twist. Besides, the barb wires are twisted between the two strand wire (line wire). Reverse twist. The strand wire (line wire) are twisted in opposite direction. Besides, the barb wires are twisted outside of the two line wire.