Product Attribute: Material: Quality Stainless Steel. Size: 0.11''/0.28cm. Effective Length: 34''/88cm. Produce Technology: Nickel Coating. Fits: Any size Acoustic Guitar.(Not For Electric Guitar). Product Features: Guitar strings service life depends on the products quality and the players habits . High E is the most vulnerable of six strings. Now you need not to run to the guitar store or pay for a whole set. Enough quantity for those players who always break thier High E string. Nickel-Coating for those playes who always own sweat hand. Individually wrapped never worried about the package opened but not used strings will face the oxidation. The rest can be stored 5 years at least.Valuable Product! Small Tips: New strings are not fully stretched, they will out of tune in playing, which is normal phenomenon. The quickest way is let them bear proper tension. For example, do this action: Bends, Release, Repeat this action several times. This allows it to be fully stretched in few minutes. After our sturdy testing, these unstretched strings have 7% chance to be broken if do that, Why? Are these terrible strings? Of course not. Unstretched strings means the force on each part of the string body is not uniform, too rude actions may cause them break, This problem happend on any brand strings. Control your strength when doing this action. Once it fully stretched, a sturdy string will be given. Package Contents: Acoustic Strings x 10.