KNOBLOCH's ACTIVES 500ADC are double silver high-tension classical guitar strings that offer excellent sound quality. This is a set of 3 sets, with the 1st, 2nd, and 3rd strings made of CX fluorocarbon, and the 4th, 5th, and 6th strings made of double silver high-tension. The clear bass enhances the expressive high strings, creating a warm yet sharp and well-defined sound. Please give them a try. A characteristic of Knobloch strings is that even with high tension, the tension on all 6 strings doesn't change by even 0.1 kg. The strings are only slightly thicker. Please try them. - Brand: KNOBLOCH - Model Name: ACTIVES 500ADC - Type: Classical Guitar Strings - Material: Double Silver - Tension: High Tension - Set Contents: 3 sets Thank you for viewing.