The E36, the largest size in the E series from the German mouthpiece specialist B. Tilz, produces a very deep and thick sound. - Model: E36 - Rim Diameter: 34.5mm - Bore: 8.4mm Thank you for viewing. It's an old item, so it has some scratches, but there are no dents on the shank. At the time, 34mm was considered the largest, but there are now other mouthpieces with larger sizes. Recommended for those with good physical strength.