Love the Groove Tube Fat Finger product! Does exactly what it says it does!
I have had 1 of these Groove Tube Fat Fingers before. I put it on my main guitar for years. It does add sustain. It does it by transferring the resonance back into the instrument by feeding back the resonant energy back in to the guitar through the headstock. It is only a slight difference, you will feel it if it is applied properly to the head stock. I bought 2 more recently, noticed right away on my Heritage guitar had increased sustain. I plan to get more for the rest of my guitars. Groove Tubes makes great products. Fender now owns this. So, they are called Fender Fat Fingers. They work on various instruments: bass, acoustic, anything it can clamp on to the headstock. It simply increases the sustain as it says. There is felt on the bottom and top of the clamp shape to not damage your instrument.
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