A Mini-Sized Mandolin, Banjo, Ukulele Combination Chord Stamp This is a quality chord stamp for mandolin, banjo, ukulele, or any four stringed instrument with a normal fretboard. And since the 1st string on a 5 string banjo usually a drone this 4 string chord stamp will work nicely. Stamped image is approximately 3/8" x 5/8", woodmount is .75" (high) x .75" (wide) x 1" (tall). The rubber is rich, moist, red vulcanized rubber that will last for years and not dry out. The rubber is mounted on 1/8" thick black foam cushion for an evenly stamped image. Each stamp is handmade in our shop in Dallas, TX.