The Elliptical Lozenge Curb Gag from Bombers Bits 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 a small amount of poll pressure, as the upper ring acts in a similar way to a hanging cheek snaffle.
Meanwhile the blue sweet iron mouthpiece with a 45mm lozenge is designed to produce salivation and help the horse to accept the bit and comfortable relax his jaw. The double joint reduces the nutcracker action, as the bit stays in a curved shape, following the contours of the horse's mouth. Therefore the bar and palette pressure associated with single-jointed bits is removed.
It is designed to be used with two reins, so the curb pressure only comes into play when it is really needed.
Please note that the blue will fade with use.
Please note that the curb gag is only legal for the jumping phases of eventing under FEI rules if two reins are used (with one attached to the main ring of the bit). Bombers recommend that two reins are used with this bit in all circumstances.