Product Attribute: Material: Quality Stainless Steel. Size: 0.14''/0.36cm. Effective Length: 35''/90cm. Produce Technology: Nickel Coating. Fits: Any size Acoustic Guitar.(Not For Electric Guitar). Product Features: Guitar strings service life depends on the quality of the products and the habits of the players. High E and B string is the most vulnerable of six strings. Now you don't need to run to the guitar store frequently or pay for a whole set. Enough quantity for those players who always break thier B 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 bulk strings can be stored five years at least. In addition, They also provide good tone and hand feel, easy to play, hard to break. Valuable Product! Small Tips: Because 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, 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 this action, 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 will happend on any brand strings. So, Please control your strength when doing this action. Once it fully stretched, a sturdy string will be given. Package Contents: Acoustic B Strings x 10.