This appears to be for a trombone based on my research. Please ask any questions or do your research. Cannot guarantee what instrument it is for.

Sold as is

The American Music 6 1/2AL mouthpiece Trombone is a vintage brass instrument with a sleek silver finish. Featuring a brass bell material, this trombone is known for its high-quality construction and precise craftsmanship. The American Music 6 1/2 AL model is a popular choice among musicians looking for a reliable and durable trombone with a classic design. Perfect for both beginners and experienced players, this pre-owned trombone is a great addition to any brass ensemble or vintage musical collection.