Michael C.wrote a review of CAMP USA Nano 23 Carabiner on May 28, 2010
I have tried a couple of other biners and this is by far my favorite. I can't believe how light they are.
Some other lightweight biners I have tried were too small... tough to work with especially with gloves on. I am much happier with these. If you ice-climb only the smaller size could be a slight drawback so you probably wouldn't want a full rack of 'em.
It is smaller than a standard biner but seems to be big enough to do the job... great for racking gear, great on quickdraws and general use.
If you are trying to drop some weight from your rack I highly recommend these!