Re: Tungsten parts
Tungsten is used also on the tips of armor piercing bullets. That's how strong it is.
I have a Tungsten Floyd Rose block. The advantage of Tungsten is it's double the mass and weight of brass. If you want a Brass Big Block on your Floyd, there are some guitars that are routed only to accommodate the stock small Floyd Rose Block and a Big Block won't fit, or rather, you get limited Trem movement. So, instead, you used Tungsten, which is the same size as a stock Floyd Rose block, but has the weight and mass of a large Brass Big Block. So you get the added mass, sustain, and tone of a Brass Big Block in a smaller package. The downside is it costs twice as much.
I wouldn't by a Big Block made of Tungsten though, the heavy weight (4 x as much as a stock block) would likely make the guitar too dark and dull.
Titanium blocks brighten up the guitar, which I hear is good if you have a Floyd with a cast plate with hardened saddles, like a Schaller Floyd or Ibanez Edge, which tend to darken or warm up the tone on their own. It would also be good on mahogany bodies.