High-carbon steel hexagonal alloy inside material. Adopt 75% and 25% phosphor outside material. Strong tightness offering resonates, extra light tension. Strings arounded in 6 circles placed in a plastic bag.Good , high glossiness, full tone. The strings of -TX series has strong durability, clearly timbre and comfortable. For Primary guitar players. Specifications: Model: TX620 Material: Hexagonal carbon steel + Phosphor size: /inch/mm: E/010/0.25; B/014/0.36; G/023/0.58; D/030/0.76; A/039/0.99; E/047/1.20 color: As Shown Product packaging size: 14.5*10.8*1 cm Package Contents: 1* guitar Strings (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.