The Grover Mini and Mid-Size kidney buttons provides the components you need to make quick repairs or modifications to your instrument. Whether you're looking to replace missing or damaged buttons or want to customize the look of your instrument, this set has you covered. The kidney-shaped buttons come in a size that fits many popular models and the included screws securely fasten the buttons in place. With the Mini and Mid-Size kidney buttons, you'll have the parts on hand for tackling emergency repairs or unleashing your creativity.