Product Description : S.I.T. String S81068 Eight String Nickel Wound Electric Guitar String The Power Wound Electric Guitar Strings Are Made With A Nickel-Plated Cover Wrap Over A Hard-Tempered Hex Core These Strings Are A Perfect Combination Of Brightness And Longevity Most Importantly, These Strings Will Stay-In-Tune The Power Wound Line Is Sitas Most Popular And Widely Used Electric Guitar String, And Suitable For All Applications California Prop 65 Warning : This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information visit to the website.