Newtone Masterclass PB 12-54 on the Lowden O-25.
Martin Lifespan PB 13-56 on the Martin D-18 and HD-28V.
GHS True Medium PB 13-56 on the Martin OM-28M. (Medium 1st, 2nd and 6th, light 3rd, 4th and 5th). Great for DADGAD.
Gibson 'Bill Monroe Signature' PB 11-41 on the Fylde mandolin.