The Weaver Equine Single-Ply Heavy Harness Split Reins. Made from top quality Hermann Oak harness leather, these horse reins offer a great feel, durability and dependable service. These burnished, single-ply leather reins have water loops and tie laces for quick and easy replacement. These heavy harness leather horse reins are paired before cutting is complete to ensure a consistent feel in both hands. The long horse reins measure 5/8 in. x 7 ft.