NYLGUT - Regular tuning, all plain strings. These strings are made in Italy from a synthetic material called "Nylgut". Nylgut is a new formulation of polymerized plastic mixed with additives and patented by Aquila. It has the closest sound to gut strings we have heard. Gauge, 1st to 4th, about 0260, 0315, 0378, 0273 inches.