This item can be attached on any type of acoustic instrument equipped with a flat soundboard. Transparent tone is achieved with the transducer for guitar. Features: This transducer pickup which has been specially designed for acoustic instruments, is a very little device lets you turn your acoustic into an electro-acoustic, giving your instrument a new lease of life for amplification purposes. Fit for almost string music instruments such as guitar ,violin ,mandolin ,banjor etc. Remove the plastic film from the back of the transducer to expose the adhesive. Place the transducer through the sound hole to the lower part of the front body where the guitar produces the best tonal response. Be sure to remove any dust before placing pickup will reproduce a full, natural, transparent tone. Pickup senses the microvibrations of a soundboard. Easy to install, convenient to use. Specifications: Material: Metal Sensor Diameter: Approx. 2.7cm /1in Shaft Thread diameter: Approx. 2cm /0.8in Full Length: Approx. 30cm /11.8in Item Weight: Approx. 8g /0.29oz Package Size: 6.5 * 6 * 2.2cm / 2.6 * 2.4 * 0.9in Package Weight: 12g /0.4oz Package List: 1 * Guitar Transducer