ADJUST THE STRINGS: This universal hollow rocker for guitar can help you adjust the strings, change the sound and pitch of the strings, and make your performance even better. EXCELLENT MATERIAL: This guitar universal hollow handle is made of high-quality metal material, safe and environmentally friendly, with a certain degree of hardness, not easy to deform, durable, and has a long service life. EASY INSTALLATION: The installation and disassembly of this universal hollow rocker for guitar is very simple, saving time and effort. You can also directly use it to replace the tremolo stick without affecting the guitar. WIDELY USED: This universal hollow rocker for guitar is very suitable for electric guitars, musical instrument stores, music classes, music classrooms and other places, and is very suitable for musical instrument lovers. SERVICE GUARANTEE: If you have any questions about the product, please feel free to contact us. We will do our best to solve the problem for you.