Great for racking
These puppies are just what I had in mind for racking my C4s. It is impossible to appreciate just how small these biners are online. They are about the size of many of those novelty ("not for climbing") carabiners that you see on car keys or water bottles, and almost as light--and yet they are full strength. I would not use them for regular trad climbing purposes (as in for extendable quickdraws) because I think that it would be too difficult to clip the rope through these when pumped, but I absolutely appreciate them for racking my cams, and am considering buying more for racking my hexes as well.