Shires Blue Sweet Iron Two Ring Gag With Lozenge girth this liner features our signature Combo Neck this liner features our signature front leg arched design for extended comfort and greater freedom of movement The Shires Hanging Cheek Sweet Iron Snaffle With Copper Lozenge features a double jointed mouthpiece with a rounded central lozenge which sits at the centre of the tongue and distributes pressure evenly the oxidation has a sweet taste which the horse likes and which encourages salivation You can easily rub the bit down with very fine sandpaper which will remove the rust and will have no adverse effects on the bit or its use