Features: Upgrade your acoustic or electric guitar with sealed guitar tuner pegs, crafted from metal for precise ratio tuning stability and corrosions resistant finish. These machine head feature internal sealed gears to prevent dust infiltration, while included mounting screws/ferrules ensure tool free installation on most guitar models. Ideal for professional musicians, guitar technicians, and enthusiasts seeking reliable tuning hardware replacements or upgrades for their instruments. Maintain consistent string tension during live performances, studio recordings, or practice with these guitar tuning pegs. The oversized square knobs provide enhancing grip for smooth adjustments, while the sealed construction ensures long lasting performances even in humid environment. Specifications: Material: Metal Color: Black/Silver Size: As Pictures Show Package Includes: 1 Set Metal Guitar String Knobs note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color from the item.