More stable: : The guitar headstock settings do not come off easily. The classic three-sided mechanism tunes the guitar strings for a finer and more stable finish. [Internal Gear] The guitar tuning heads are equipped with heavy, solid and comfortable internal gears , which effectively prevent the screws from slipping. These tuning knobs are compatible with classical guitars. High quality: : The tuning head is made of high quality metal and plastic. It is sturdy, rustproof, corrosion resistant and durable. A great alternative to Les Paul style electric or acoustic guitars. Refined Design: : Classic and elegant pattern in gold and black. Combines perfectly with wood grain guitars and brown guitars.