[b] Wilma Titanium Mouthpiece goes with the Otto combination bit. When you order a mouthpiece for your combination bit, please select a size that's 1cm larger. [u]Please understand:[/u] We make the mouthpieces just for you once you order. So, you can't return or exchange them. We create them from our standard loose ring bits to fit your needs.[/b] This lets us give you a variety of mouthpiece options and sizes for your custom bit! [i]If you would describe your horse as something with the following;[/i] * Stiff towards the hand * Strong, usually leans on the bit * Heavy in the hand