Fender Original Bullets snarenset elektrisch pure nickel roundwound light top regular bottom.009-.011-.016-.026-.036-.046
With its long history of instrumental innovation, it’s no surprise that Fender eventually turned its attention to guitar string design. Specifically, Fender engineers of the early 1970s were aware that the standard ball-end string design that had prevailed until then presented very specific tuning problems, especially on tremolo-equipped guitars.
The problems lay in the design of the string themselves. On ball-end strings, the core wire of the string wraps around a separate piece, a tiny metal “ball.” This creates a small V-shaped area of “slack” fit in the two places where the wire loops around the ball. At normal string tension, this “slack” wire loop is taut and unbent, and the ball end is prevented from completely abutting the bridge plate (or, in the case of a Stratocaster, from sitting completely snugly in the trem block channel). This fit isn’t the most optimal form of contact between the end of the string and the bridge.
An effect of the ball-end design is that when bending a string, the wire in that small slack area bends slightly, allowing the ball-end to seat itself more closely against the bridge. Then, when “diving” the tremolo, tension on the bridge end of the string is briefly released, causing the slack area to attempt to spring back to its original un-bent position, only to “re-bend” when bending the string again. The problem is that when the string returns to tension, it might or might not be seated against the bridge exactly as it was before, which means there’s a pretty good chance that it will be slightly out of tune. Another problem is that, on Stratocaster guitars, ball ends often get wedged in the tremolo block channels pretty tight, making them difficult to remove when changing strings.
Fender engineers sought to remedy this situation in the early 1970s by designing a new string end that optimized contact with the bridge. They did away with the ball-end design entirely. In fact, they did away with whole idea of winding the string around a separate end piece.