Trust curb gag jointed. The Blue Sweet Iron Curb Gag from Trust Equestrian has a sliding rope action on the cheekpieces, which applies pressure to the horse's curb groove via a leather pad, rather than the strong poll pressure applied with a conventional gag bit. There is still some mild poll pressure, as the top ring acts in a similar way to a hanging cheek snaffle. Meanwhile the blue sweet iron mouthpiece with a single joint is designed to produce salivation and help the horse to accept the bit and comfortably relax his jaw. The mouthpiece is curved, which distributes pressure more evenly over the tongue and bars. The offset centre link reduces the nutcracker action and pressure points on the tongue. It can be used with 2 reins, so the curb pressure only comes into play when needed.