Fowl Play, you get what you pay for. Those clips are very bad and breaks very easily, you don't even need to pull much (I had those broke on me couple times too). I'd still advise to look for pair of slobber straps (like this one Slobber Straps (Pair) - Horse.com), buy a good yacht rope in local TSC or other similar store and do it yourself. Or buy the used ones (could be some in classified section here).
P.S. BTW, I had VERY bad experience with stuff from horselovertz before: the hackamore I got broke apart in pieces after 3-4 times.