Hybrid Slinky Strings. Axiom Guitar Strings are individually selected and specified and made entirely in the USA in one of the world's most prestigious string factories. We use only the finest nickel, phosphor bronze and nylon to create our strings and we feel they are easily the equal of any of the "big name" brands. Our electric range is made of a special blend of 8% nickel and other introduced metal alloys which gives these strings a special high output with long sustaining tone, 8% Nickel is the most popular string for today's rock guitarists who wants the output and tone most prevalent in today's sound. Gauge is 10 - 13 - 17 - 30 - 42 - 52We are proud to bring you these superb quality USA made strings at half the price of the "big names"!