This "Fat" brass big block will add mass and sustain to your Floyd Rose Pro bridge along with the tonal qualities of brass. Genuine upgradable block for Floyd Rose Pro Tremolo System. 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. While greatly strengthening chord clarity and beefing up individual tones, it also greatly improves resonance, especially in the midrange of the instrument. All of these improvements are accompanied with the undeniablyÃƒâ€šÃ‚Â vintage sound and feel of this time-tested material. Since this block is larger than a conventional sustain block, it can also limit upward travel of the tremolo and can be set to rest against the body in a blocked bridge configuration. For floating bridge setup this block may require some routing in the spring cavity.