TS4248 is the upgraded model from TS4240. it features a re-designed neck which improves the tone and the response and a newly-designed thumb hook which provides a comfortable and relaxed playing experience. Also added is an adjustable screw at Low B Key and upgraded PISONI pads. This instrument retains the advantage on using the double key arms and the large bell flare. It gives the player the powerful sound and the well-built mechanism that they are looking for in TS4240. SERIES Antigua Pro KEY Bb. NECK Newly designed. BODY Yellow brass. BELL Enlarged bell with yellow brass. CONSTRUCTION Fully ribbed. PADS & RESONATORS PISONI pads & metal resonators. BELL DECORATION Hand engraved. THUMB HOOK Newly designed