High-carbon steel hexagonal alloy inside material.Adopt 75 percent bronze and 25 percent phosphor outside material.Strong tightness offering excellent resonates, extra light tension.Strings arounded in 6 circles placed in a plastic bag.Good feeling, high glossiness, full tone. The strings of -TX series has strong durability, clearly timbre and feeling comfortable. For Primary guitar players.color: Gold and green packagingModel: TX620 : or inch or mm: E or 010 or 0.25 B or 014 or 0.36 G or 023 or 0.58 D or 030 or 0.76 A or 039 or 0.99 E or 047 or 1.20Material: High carbon steel and phosphor bronzePackage Contents: 10 setx guitar Strings (6pcs or set)Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.