Keep the Circle of Fifths handy for reference with this sturdy accessory. Great for figuring out the chords to songs, or for transposing to different keys. Choose between laser engraved full grain leather or clear acrylic. Diameter is 2.1 inches or 54 mm. There is a handy 3/8 inch (5mm) diameter hole for a hanging cord for your case, or for your uke (cord not included). Circle of Fifths mini is 1.75" and is available in clear acrylic only.