1、Metal strings are made of good quality copper alloy with colorful coatings, very durable to use. 2、These light acoustic guitar strings offer a long lasting, warm, bright and balanced acoustic tone with excellent intonation. 3、Use advanced anti-rust technology, which is rust-resistant and not easy to fade, ensure long time usage. 4、Fully automatic winding machine production, good control for material quality and product performance. 5、It is a good guitar replacement, compatible with most acoustic guitar. Features: 1. Metal strings are made of good quality copper alloy with colorful coatings, very durable to use. 2. These light acoustic guitar strings offer a long lasting, warm, bright and balanced acoustic tone with excellent intonation. 3. Use advanced anti-rust technology, which is rust-resistant and not easy to fade, ensure long time usage. 4. Fully automatic winding machine production, good control for material quality and product performance. 5. It is a good guitar replacement, compatible with most acoustic guitar. Specifications: Material: Copper Alloy Quantity: 6 strings Weight: 27g/ 0.95oz   Packing List: 1 x 1E 1 x 2B 1 x 3G 1 x 4D 1 x 5A 1 x 6E