TS3108 is the upgraded model from TS3100. It improves the mechanism at the low B with the adjustable screw, which provides faster response to the key. It is also equipped with a newly designed thumb hook which provides comfortable and relaxing playing experience. This instrument retains the advantage on TS3100 with a professional specification at a modest price. It is perfect for the advancing student or aspiring professional players. More information about TS3100. Features. Thumb hook. Newly designed thumb hook gives more comfortable feel. Improved mechanism. An adjustable screw at the low B which provides faster response to the key. Pads. Pisoni pads. Specs. Series: Antigua. Key: Bb. Construction: Post to body. Auxiliary Keys: High F# key. Thumb Hook: Adjustable (brass). Neck Material: Yellow brass. Body Material: Yellow brass. Bell Material: Yellow brass. Pads & Resonators: PISONI pads & metal resonators. Bell Decoration: Hand engraved. Finish: Lacquered body and keys