Floyd Rose FROTuB37 Tungsten Sustain Block 37 mm – Maximize Your Tremolo's Sustain

The FROTuB37 Tungsten Sustain Block 37 mm is a precision-made, high-density upgrade for tremolo systems. Swap your stock bridge block for this tungsten version and experience a marked increase in sustain, note clarity, and overall tonal definition. Engineered at 37 mm, the block fits most Floyd Rose spring cavities without modification, so players can install it and immediately benefit. Extra mass and hardness help retain more vibration in the bridge for a cleaner, longer sound.

Unique Properties of the FROTuB37

Tungsten is valued in guitar hardware for its extreme density—over four times that of titanium and double that of brass. When installed, the FROTuB37 adds as much as half a pound of mass to your bridge, resulting in pronounced sustain improvements with no guitar alterations required.

Functional Specifications for Seamless Upgrade

• Material: Tungsten — delivers top density and hardness to optimize vibration transfer
• Block Length: 37 mm — tailored to the original spring cavity size for Floyd Rose bridges
• Compatible with Floyd Rose Original Series 6- & 7-string, Special Series, and 1000 Series 6-string tremolos for an easy drop-in upgrade.
• Mass Increase: ~199 g (7 oz) — significantly increases bridge weight for sustain

Performance Outcomes

With the added mass and hardness of tungsten, more resonance stays in the bridge instead of dissipating into tremolo springs. The result is a brighter, clearer tone and a longer-lasting note—especially noticeable on lead and clean passages. Players will hear and feel a difference as soon as the block is installed.