Premium Wooden Truss Rod Covers Elevate the look of your guitar, bass, or acoustic guitar with our exquisite wooden truss rod covers. Crafted with precision from high-quality beech and ash, these covers add a touch of elegance and personalization to your instrument. To ensure optimum sound quality, it is important to apply rosin along the entire length of the bow. This treatment facilitates the necessary friction between the strings, allowing the instrument to produce a richer and more resonant sound. >>> Unfinished 12-14 mm thick or finished Covers with desired thickness, complete with machined edges. <<<