High-carbon steel hexagonal alloy inside material.Adopt 75% bronze and 25% phosphor outside material.Strong tightness offering excellent resonates, extra light tension.Strings arounded in 6 circles placed in a plastic bagGood feeling, high glossiness, full tone. The strings of -TX series has strong durability, clearly timbre and feeling comfortable. For Primary guitar players.color: Gold & green packagingModel: TX620 : /inch/mm: E/010/025; B/014/036; G/023/058; D/030/076; A/039/099; E/047/120Material: High carbon steel + phosphor bronzePackage Contents: 10 set* (6pcs/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.