I have since purchased about a month GraphTech Ferraglide bridges for my LTD Viper and I'm very satisfied.
it slightly changes the sound of the guitar without any time it is unpleasant, but most of these bridges over graphite is that I break less strings (I play metal and I sing too, both c ' is not easy to retain shot picks ) And I gained hugely sustain, the difference is surprising.
Short but good, for I have ordered against the states in five days at least while costing less than in France.
Purchased by http://www.guitarpartsresource.com/guitar_index.htm