The Alice acoustic guitar strings feature a stainless steel core wounded with a copper alloy. They are of standard gauge (E: .012), which is the most common gauge of acoustic guitar string that provides both sound quality and playability.  The solid steel core provides a bright, clean sound and the overall string is resistant to corrosion due to the copper alloy. 
 
 
Specifications: 

Stainless Steel
Steel Core
Coated Copper Alloy Wound

String diameters: 
E: .012
B: .016
G: .024
D: .032
G: .042
E: .053