Marcinkiewicz ET3 Charlie Loper model small-bore trombone mouthpiece Marcinkiewicz mouthpieces are known for their light and airy feel, while still maintaining a full sound in the high register, allowing for maximum control across the entire range. They are also famous for having very little variation between individual pieces compared to Bach, thanks to their precise design and drilling technology. The model name is ET3 Charlie Loper model. The size is equivalent to a Mount Vernon era Bach 11C. This is the most standard shape among Marcinkiewicz's signature models and can be used for multiple purposes. The feel is similar to a Bach 11C, but with improved playability, control, and response. The condition is quite good. Marcinkiewicz mouthpieces currently take 6 months to a year to get new, and used small-bore mouthpieces are not often available.