This is a piezo pickup which fits for most string music instruments such as guitar, violin, mandolin etc. It makes your instrument produce excellent sound while perfectly restores the . Easy to install, reused design, and never harm to your instrument. Self-adhesive back tape allows you stick it through the sound hole to the lower part of the front body where the guitar produces the best tonal response. Feature - Color: White. - Size: 13 x 3 x 0.64 cm - Material: Plastic and copper - A piezo microphone pickup. Piezo pick up sound by being in direct with the sound source. - interfering external sounds and not be sound reflections from nearby objects. - Easy to install. Self-adhesive back tape allows you stick it through the sound hole to the lower part of the front body where the guitar produces the best tonal response. - You can install it on your guitar, mandolin, banjo, violin, ukulele, viola, , etc. Package list: 1 x Piezo pickup