From Amazon
D'Addario Guitar Strings - ProSteels Electric Guitar Strings - Round Wound - Brighter, Crunchier, Increased Sustain - EPS515 - Medium, 11-50
GAK
D'Addario EPS515 XL Pro Steels Electric, Medium, 11-50 Electric Guitar String
HW Audio
D Addario EPS515 ProSteels Electric Guitar Strings, Medium, 11-50 (EPS515)