Augustine spectra electric strings are light nickel-plated strings featuring cultivation and completion of the famous Segovia sound. Choose from extra-light (. 009-. 042), light (. 010-. 046), medium (. 011-. 048) and heavy (. 012-. 054). The heavy set features: · E1 - . 012 inch. - 0. 300mm · B2 - . 016 inch. - 0. 406mm · G3 - . 020 inch. - 0. 508mm · D4 - . 032 inch. - 0. 812mm · A5 - . 042 inch. - 1. 066mm · E6 - . 054 inch. - 1. 371mm.