So I own one bass, (I'm building one from the ground up right now but that's another story) and I play a lot, at least two to three hours a day and have been, fairly consistently for the last six months or so, and I have broken three strings in that time: two Gs and one D. The first one was a G string. Now, there were many reasons I thought of as to why I broke this one: 1) it was an old string, I bought the bass second hand from a guy who bought it in 2002 when it was brand new (it's a 20th anniversary squire p/j), and he never changed the strings. 2) I slap, or more specifically pop with a lot of force which I backed off of after I broke this string. So I just dismissed the string breaking as something that happens (we've all seen that video of Victor Wooten popping his G a bit too hard). So I borrowed the G off of a friends bass (as he's a guitarist and never really plays his bass anyway). Next, I broke this string after about three weeks, and what's more is I broke it in EXACTLY the same way: down strumming a 5 harmonic on the A, D and G with a .88mm USA nylon Dunlop pick. This time some of the same things occurred to me as to why the damn thing broke again: 1) the bass that I took the string from was second hand and old as well; but this time there was new evidence: I broke the string in the exact same was as I did the other! So this time I thought to myself 'you just have to stop playing harmonics with a pick' and thought 'well that's that', but the next day I saw that there was a burr on the saddle so now I jumped at this as the problem and sanded it down very smooth with up to 13 micron glass polissing paper so I new it wouldent break another one of my strings. This time the way I broke the D string was different: 1) I was popping (too hard), 2) it was one of the old ones, the 13 year old ones, 3) I had been playing (as I said erlyer) far too hard for far to long on it, and finally I found a burr on that saddle as well. So with all these thing said in order to get the most help possible I'll post a picture of the D that broke so you guys can look and see for yourselves what might be up with my bass. One of the reasons I'm posting this is that all of the string physically came apart in excataly the same way: The goddamn core wire snaped and the windings unravveld about a inch directly above the inntonation point of the saddle.