Musiclily Alice Stainless Steel & Coated Rainbow Colorful Color 6-string Guitar Strings Set for Folk Acoustic Guitar Fit for regular size of acoustic guitar greatly The Guitar Strings are in the material as follows: 2 strings in Stainless Steel; 4 strings in Colorful Coated Copper Alloy Wound Specifications:E string -1st Stainless Steel .011" 0.28mm; B string -2nd Stainless Steel .015" 0.38mm;G string -3rd Colorful Coated Copper Alloy Wound .024" 0.61mm;D string -4th Colorful Coated Copper Alloy Wound .032" 0.81mm ; A string -5th Colorful Coated Copper Alloy Wound .042" 1.07mm; E string -6th Colorful Coated Copper Alloy Wound .052" 1.32mm Made of colorful coated copper alloy;Tunes stable, sounds great Package Included 1 Set Acoustic Guitar String