Specifications ◆ Model Name: GE101TS ◆ Finish (Color): C / Chrome ◆ Type: Tremolo Unit ◆ String Pitch: 11.3mm ◆ Contents: Tremolo body, arm, mounting screws x6, springs x5, spring holder, holder set screws x2, wrench, instruction manual This is the GOTOH GE101TS, a 6-point synchronized tremolo unit. It's a reliable item, also found on high-end guitars. Made in Japan by GOTOH, known for its high-quality, premium parts. There's no other company in Japan that can produce products of this quality. The difference between the GE101TS and the GE101T is that the inertial block (sustain block) is made of steel/iron, resulting in a more vintage-inspired sound. Also, as a minor change, the saddle screws are US standard, and there's a slight difference in the arm insertion hole: GE101T: 5Φ, GE101TS: 4.8Φ. The screw spacing for mounting is 11.2mm, a common metric standard. Many models can be swapped out directly. GOTOH's official website has a dimensional chart, which is the most reliable way to confirm compatibility. The nut and bridge (tremolo unit) are where the vibrations of the strings are first transmitted. If you cut corners here, the quality of the body and neck wood won't matter. Please refer to the GOTOH official website for the diameters and sizes of each part.