Material: Strings 1-3 are nylon, strings 4-6 are silver-plated copper wound nylon. Gauge: Shown in the image. This is a set of strings for a Chinese-made classical guitar. How about using them for practice? Available for an additional 280 yen per set. Please consult before purchasing if you wish to purchase. Shipped via anonymous delivery. Shipping costs will be discounted if you purchase other items that can be shipped together. Please consult before purchasing if you need multiple sets, etc.