Ultra and Burly Slinky’s are the newest additions the Slinky guitar string family. These new hybrid gauges combine popular slinky string sets offering additional options in terms of tone and feel. Ultra set combines Regular and Power Slinky sets, with gauges of .010, .013, .017, .028, .038, .048″ and the Burly set combines Power and Skinny Top Heavy Bottom Slinky sets, with gauges of .011, .014, .018, .030, .042, .052″.