F.A. Uebel 740 Bb-Bass Clarinet Mopane, Bb Bass Clarinet, German system, Tuning slide in S-bow, 4 Thumb keys going down to low-C, B1 mechanism with 2 automatically switching duodecimal keys, 4 Trills on the upper part, Fork B and fork F action, Double C- and F-key respectively, F-lever, B-C# trill key, Adjustable thumb rest with ring for carrying cord, S-bow, cup and keys silver-plated, Incl. BAM case and F.A. Uebel mouthpiece, Material: Mopane wood