The Thalia Capo will work great on your Mandolin, but will require our XL fretpads which are 2mm taller than our standard guitar fretpads.  If you are buying the capo for use solely on a Mandolin and do not need the guitar fretpads, then you can add an order note saying that you want the XL fretpads Only and we will send you XL Fretpads instead of the standard guitar fretpads free of charge. If you want both, then you should add the XL fretpads as an accessory to your order.