Feature: 1. 6pcs/set guitar strings designed for classical guitars. 2. The whole set is black and wound by automatic winding machine. 3. The G-3rd, D-4th, A-5th, E-6yh strings are made of high-flexibility multifilament. 4. Adopts anti-rust technology of coating, the anti-rust duration of strings is 4-5 times longer. 5. Comes with a complimentary G-3rd string. 6. Comes with a complimentary G-3rd string. Offers mellow tone, comfortable feel and a different sense of inspiration on playing. Specification: Features: 6pcs/set guitar strings designed for classical guitars. The whole set is black and wound by automatic winding machine. The G-3rd, D-4th, A-5th, E-6yh strings are made of high-flexibility multifilament. With proprietary anti-rust technology of coating, the anti-rust duration of strings is 4-5 times longer. Offers mellow tone, comfortable feel and a different sense of inspiration on playing. Comes with a complimentary G-3rd string. Specifications: Model: AC136BK-H (Hard Tension) Note/Inch/MM: E-1st/.0285/0.72; B-2nd/.0325/0.83; G-3rd/.026/0.66 D-4th/.030/0.76; A-5th/.036/0.91; E-6th/.044/1.12 Package size: 13.5 * 11.5 * 1cm / 5.3 * 4.5 * 0.4in Package weight: 36g / 1.3oz Package List: 7 * Strings Package List: 7 * Strings