Tungsten Sustain BlockOur exclusive tungsten sustain blocks for Floyd Rose tremolo bridges offer the highest density available in a block that conforms to the original size specifications of your Floyd Rose bridge. When it comes to sustain, the single most important property of a metal is density followed by hardness. Tungsten is over 4 times denser than titanium and more than twice as dense as brass. To equal the mass of our tungsten sustain block, you would need a