1、ACCURATE CONTROL: The guitar control knob allows for adjustment of each string of the instrument to improve sound accuracy and finer control. 2、DUAL STACKED KNOB: This double stacked knob adds an extended range available for guitar or bass, allowing for a wider range of music sounds. 3、METAL MATERIAL: These guitar control knobs are made of excellent metal, with high hardness, wear resistance, and scratch resistance. 4、EASY INSTALLATION: This dual stacked knob has compact size with non slip texture, easy to install and replace, without slipping or cracking. 5、REPLACEMENT PARTS: Including 3pcs knobs, compatible with various electric guitar and bass, which can directly replace the old or damaged ones. Item Type: Guitar Knobs Material: Metal 3 x Guitar Knobs 1 x Wrench