[b]Niklas 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! Fager Niklas is suitable if you would describe your horse as the following; * Trows their head, chews on the bit. * Unsteady in the connection. * Feels stiff in any standard straight bit. * Doesn't instinctively seek out the contact.