. This headrest is perfect for any instrument job, making it easy to change strings! Protect your guitar from scratching/slipping when working with it, such as cleaning or repairing it. Suitable for most instruments with neck, guitars, basses, ukulele, mandolin, banjo and much more. It can support the neck stably, and the stopper will not damage the neck. The two heights can fit different instruments. Specification: Material: Mahogany with felt inserts Product Dimensions: Length 3.74" (95mm) x Width 2.4" (60mm) x Height 2.6" (65mm) Groove: Height 0.6" (15mm); Width: 2.16" (55mm) Package Dimensions: 4.7" x 2.8" x 2.9" (120*70*75mm) Product Weight: 120g (4.32oz) Instrument: Suitable for almost any neck instrument, guitars, basses, ukulele, mandolin, banjo, and many other ..... Applications: perfect for any instrument job, makes string changes easy! This is a must have for guitar repair shops and who want to create their guitar setups. Note: Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Included: 1 × Guitar Headrest 1 × Anti-slip Sticker