JHL Market Harborough
JHL Market Harborough. The JHL Market Harborough is an economically priced Market Harborough that comes complete with webbing reins. The JHL leather work is a range of high quality leather work finished to a high standard, equally suitable for everyday or show use. The market harborough is a training aid used to help prevent the horse from throwing his head above the point of control offering far more direct control than a running martingale, but at the same time allowing the horse freedom of movement when the reins are released.