Hello Everyone, Im new to this site and I am a little taken back by the vicious comments concerning the Rock Blocks. I have recently had a 42mm Block installed on a 30 year old Charvel built by Kevin Kaufman ( Kaufman/ Danzer instruments. It was installed on a new German made Floyd and set up at Palm Bch. Guitars. In all seriousness, it sounds amazing. Ive had two or three trems on that guitar an this system totally sounds the best Clarity,sustain, tone. For me personally Im 100% satisfied with the results.I have nothing to gain by this post other than it is only fair to give it an honest review. Im certainly no nasa scientist or geological expert. I am however a guitarist. I do know tone and what sounds good.If its not your thing ,ok, move forward. to any,one else,Try It. It Works