A. This bass tuner is suitable for open bass tuning keys and fits most 4-string electric basses, offering precise, responsive tuning with smooth gearing that stays in place, providing finer tuning and greater stability. B. The 4 strings have a metal inner core and are made of nickel-plated alloy with automatic winding, which helps increase the brightness, sustain, and intensity of the tone. It is suitable for both right-handed and left-handed 4-string basses. C. Gear size: 19mm. Fits 4-string basses and electric basses. D. The electric bass knobs are crafted from metal, featuring a unique plum-blossom shaped button with an attractive design, convenient to rotate and adjust, and offering higher stability. E. Package includes an opened gear bass tuner peg, serving as a good replacement for most basses and guitars. F. Specifications: Material: Metal; Color: Black, Silver; Type: Left, Right; Size: As Picture Shown; Weight: Approximately 95g. G. Package Includes: 1 Piece Bass Tuning Peg. H. Note: Please allow 0-1cm error due to manual measurement. Make sure you do not mind before bidding. Due to differences between different monitors, the picture may not reflect the actual color of the item.