This is a semi-hard trombone case from KTL. It's for tenor trombones, including those with an F-attachment. I used it with a 42B and an 88H. Please note that a tenor trombone with a Thayer valve will fit, but it's a tight squeeze. I don't have a Hagmann valve or any newer valves, so I can't say for sure. It shows signs of use. Thank you for looking.