As for the gauge, Malmsteen himself chimes in, “People have an illusion that heavy strings will give them more sustain—bulls**t,” he says. “I use a hybrid .008-.048 set because thicker unwound strings don’t make much of a difference, yet they’re harder to play. But thicker wound strings do make a difference for chunky low-end. On a regular .008 set, the low strings are like spaghetti! What’s also important is making sure the guitar’s action allows the string to vibrate freely and breathe more. That’s where your sustain comes from, not heavy strings.