Ernie Ball 2915 M-Steel Skinny Top 10-52 Electric Guitar Strings. The Ernie Ball 2915 M-Steel Skinny Top 10-52 is a set of electric guitar strings made with a “Maraging” steel alloy and with a skinny top/heavy bottom scale .010 .013 .017 .030w .042w .052w. M-Steels produce a rich, full tone and offer greater output, greater stability and greater durability.