MAKE YOUR OWN MUSIC! ! ! Donner is resolved to continue to create innovative and excellent instruments which maintain the high quality that inspires professional artists and creators, and yet are approachable enough for anyone to play. After hundreds of tests, Donner finally customized a set of strings with excellent performance. Phosphor Bronze Features Donner acoustic guitar strings are made of 92% copper, 7. 7% tin, 0. 3% phosphorus wire. They have a warm, rich and balanced tone with superior intonation and consistency, delivering a traditional feel. The core is made from brass plated high carbon steel hex wire, providing excellent durability. And the anti-oxidation coating protects the strings from corrosion. Donner's Exclusive Guitar String Specification The string gauges in this acoustic string set include: Plain Steel 0. 011in, 0. 015in, Phosphor Bronze Wound 0. 024in, 0. 032in, 0. 042in, 0. 050in. High-frequency zone: use finer specifications 011~015 for E1 and B1 to bring a brighter and more prominent high-frequency, which are more favorable for pushing strings. Medium frequency zone: use the conventional 024~032 to make up for the lack of high frequency of common strings, and the medium frequency can be more coherent to the high frequency. Low frequency zone: different from common 040~052 combination, use 042~050 to better cohere the medium and low frequency, finer bass strings to ensure comfortable finger feel while avoiding low frequency turbidity. Suitable for Different Materials of Resonance Boxes: Equipped with full mahogany body: full / warm Equipped with spruce mahogany body: bright / warmer Equipped with spruce rosewood body: bright / balanced Specifications Material: 92% copper+7. 7% tin+0. 3% phosphorus wire Light Gauge: 0. 011-0. 050in Package includes 10 Sets of Donner DAS-20L guitar strings (6 strings per set)