Stampola Mini 4 String Chord Rubber Stamp with ink pad Portable. Comes in a small, ziplock plastic bag that is resealable. Fits right in your case. For bass, ukulele, mandolin and banjo chords For Guitar Students, Teachers, Songwriters or just Players Stampola Brand Made in the USA - Very High Quality - Clear Maple Wood Mount, Rich Red & Moist Vulcanized Rubber and 1/8" Thick Foam Cushion. Fantastic Learning Tool. Makes remembering that rarely used chord simple, it's right there on your music.