I purchased this string retainer to replace the one on my cheap guitar because this, unlike the original part, is curved on a horizontal axis, so the strings do not come in contact with the edges of the retainer (which were fairly sharp on the stock retainer) and only push against the smooth curved underside of it. I have yet to do any testing on whether it actually prevents the strings from breaking at the point of contact, but, having made this easy and inexpensive modification, I sleep much better during the night, so to speak. Also, this retainer is closer in looks to a genuine Fender part from a certain time period than what you would usually find on a budget Fender copy.