Heavy Marathon brown leather reins for Team leaders have buckles midway for adjustment  (Achenbach style) or as a option can be ordered without the adjustment feature (modern style)

The modern style also comes  with loose multi hole end pieces so the length can be adjusted at the bit

21mm. (=7/8 inch) wide

Buckle fittings: Stainless steel or brass (brass buckles have steel pins for strength).