Not sure, but last time I had my saddle re-flocked and checked, lady said to keep an eye on them for this and also to watch the straps they attach to on the saddle (can't think of the proper technical name for 'em!). I have stretched a pair of mine so that one is longer (just slightly) than the other. Most annoying as it makes me wriggle about somewhat and I am always wondering if the saddle has slipped!