QUICK and EASY magnetic attachment. NO INSTRUMENT MODIFICATION REQUIRED - With the Cling On Pickup there is no need to drill or modify your instrument in any way. There are no permanently glued, bolted-on or screwed-on parts. NATURAL & BALANCED SOUND - The magnets have a dual purpose. Not only do they make attachment super easy, but they also create constant pressure on the soundboard, resulting in a more sensitive, balanced and accurate sensing of the vibrations. Works great on both guitars and ukuleles!