So I'm building my own V guitar, and going to order a custom Floyd bridge, but there are a couple things that confuses me. First is the block, the list consists of brass, tungsten steel, stone and titanium and the sizes from 32mm up to 42mm. What is the pros/cons of each material, and size, and ultimately, which should I get? The other thing that confuses me is the nut size, that is listed from R1 up to R10, I going to take a guess that those are just varying sizes, and I did measure the nut shelf at 1'11/16s (if I remember correctly) So, if anyone can help, I would appreciate it. Thank you :D