Warburton French Horn Rim*This product might have been tried before in our store. If you want us to order you a brand new backbore (or any mouthpiece related item) write to us ! Warburton manufacture a complete line of mouthpieces for Trumpet, Flugelhorn, Piccolo Trumpet, Cornet, French Horn, Trombone, and Tuba plus our growing line of top quality accessories for both brass and woodwind instruments.