I play drums, percussion, and occasionally acoustic guitar in a band. All the instruments I'm selling have been tested by me, and I can recommend them with confidence. I also have other music-related items for sale. #mondo band related products These are brass bridge pins that sparkle on stage. The sound also became... I think it did, anyway, lol. The size may not fit some guitars. The diameter of the pin base is approximately 5.0mm. Please be aware that if the hole size is larger than this, it will be loose. I had no problems with my Morris, Ovation, and Aria guitars, but it was loose on my Taylor. I use vinyl tape on the pins to adjust the fit.