One barb segment, according to Glover, the barb is "all aluminum Ross type four point wire" This barb is a possible variation of Ross's Four point, Patent date: June 10, 1879, Patent # 216294. Noble G. Ross of Chicago Ill. Type of barb: Aluminum Alloy, Points on barb: 4-point, Gage of Barb and wire: Standard gage wire, Coating on barb/wire: Aluminum, Type of strand: Two wire twist, Direction of twist: Clockwise