These are Official Floyd Rose L-Shaped Fat Brass upgradable Sustain Blocks for Floyd Rose Tremolo units. Studies have shown that Mass = Sustain. The Fat Brass "L" shaped sustain blocks by Floyd Rose have been specifically designed to take advantage of the unused area under the tremolo arm. By incorporating an additional "L" shape of brass to the design of a stock sustain block, Floyd Rose has been able to utilize this previously unused space for additional mass, which equates to more sustain and additional tonal qualities of brass.Brass has been a much desired material for guitar luthiers dating back to the invention of the instrument; it is notorious for increasing warmth and clarity simultaneously, a rare combination.
