These guitar string tuning head buttons are professional and simple. Classic design, elegant and beautiful, both practical and decorative. Fine workmanship ensures good working performance and longer service life. Good for the daily guitar tuning demands. Features -Color:Black -Material:Zinc alloy -Size:1.90X1.40X0.60cm/0.75X0.55X0.24in - Easy to install with the compact size and simple structure, save your time and efforts. - For the quick and precise tuning, which is reliable and professional, suitable for both professional and beginners. - Zinc alloy material to ensure long-term use. Professional guitar instrument tuning parts. They are small and lightweight, easy to use. - The guitar tuning head buttons are easy to install and convenient to use, can be both suitable for beginners and professionals. - Fine workmanship, high hardness, not easy to deform or break, you can use rest assured. Package list: 6 x Guitar 6 x screws 12 x gaskets