The lightweight but tough mar-proof black vacuum-formed shell from MTS comes with aluminum valance and is plush lined. All hardware is backed by steel washers. The protective interior will fit most F Attahment Trombones including standards like the Bach 42BO, Conn 88h and 88HO, King 3BF, Getzen 700, Capri, Eterna and Custom, as well as Edwards T-350.