Product name:Acoustic Guitar String Set Product size about : Product color: As shown in the figure Product material:Phosphorus copper alloy product features: The single-layer nano-film ultra-thin film ensures a comfortable feel while reducing external corrosion, anti-oxidation and anti-rust. Phosphor bronze winding has good sound transmission performance, strong penetration, smooth feel, high density and anti-corrosion. TX620 has a soft feel, suitable for guitar beginners, and the tone is solid and bright. TX630 has a moderate feel, suitable for guitar beginners, and the tone is warm and soft. TX640 has a slightly hard feel, suitable for guitar beginners, and the tone is thick and full. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can contact us at any time. We will give you some suggestions, but for your reference only. Shipment includes: 1 set Acoustic Guitar String Set