The SKB tenor trombone sax is made from molded plastic and has molded-in bumpers for added strength. Rubber feet plush lining 3 heavy-duty latches and hinges. Fits straight tenor trombones with 8 bell. SKB is a premier supplier of musical instrument cases. SKB builds their products with military-spec ultrahigh molecular weight polyethylene and premium hardware. All SKB hardshell cases are unconditionally guaranteed forever. That means if you break the SKB-360 they will repair or replace it at no cost to you.