S.I.T. is short for 'Stay In Tune' and we have found these strings to deliver again and again! I (Dreyden) have personally been using this brand since before our endorsement with the company and have been pleasantly surprised with their durability, tone, and consistency. As an added bonus they are manufactured right here in the U.S.A. - in Akron, OH actually. From guitar, mandolin, banjo and bass all the way to steel guitar and ukelele they really do carry a string for everyone!