Took nearly 6-weeks to arrive from China, but they appear to be good quality... at least the same quality as some of my mid-range bands.  The assortment is good, although I'll likely never use some of the sizes.  At least two of my broken watch-bands can now be repaired with unbroken cotter-pins :)

Update:  Well, I thought I could repair my broken Bulova bands... but these cotter pins are not "thick" enough to grip in the holes like they should.  They grip/grab, but I can push them right out, with very little force, using a push-pin.  The factory pins require a tool for removal because they are larger diameter and have larger heads.  I was able to replace the broken pin in one of my Wenger bands... these fit that band well.