JCraft X Heavy Core 4-String Electric Bass Guitar String 50-110JCraft X Heavy Core Bass strings are built in custom gauges perfect for drop and heavy tuning. They are forged with the timeless combination of hexagonal core wrapped in nickel alloy for the best tone and durability. The heavy drop 4 is thicker than regular bass strings, perfect for down tuning. 1st String: 0. 050 2nd String: 0. 070 3rd String: 0. 090 4th String: 0. 110 For regular gauges, try the JCraft Regular Electric Bass Strings