Laskey 30H Mouthpiece Eastman Reproduction Shank is a universal shank. ◆30 Series (30 at the beginning of the product name) This series has a slightly larger inner rim diameter. Many mouthpieces are currently made starting from this size. The popular LASKEY models 30H/30G are this size. Inner rim diameter: 32.89mm Throat diameter: 8.20mm ◆H Type (H at the end of the model name) For B.C. Tubas This model is inspired by the Chicago style. Also known as the Helleberg style. It is a typical V-cup model, characterized by a soft, dark sound. Like the LASKEY 30H and Schilke Helleberg II, this type has produced many models loved worldwide. It is especially compatible with C tubas with front pistons, and its enveloping sound, like that of an organ, is highly supported worldwide. Details are unknown as it is a used item. It shows signs of use, and there are scratches on the shank, so it is being offered at a relatively low price. Recommended for those who want to try this type first.