A couple of months back I got a couple of EFS Pro Micro Mini Bands.
They're originally intended for adding a very small load to band-resisted bench press. I've been using these for band-resisted activities with children, who aren't strong enough for even the small bands.
For adults, they're probably too small for any substantial exercises, except perhaps for rotator cuff work.
However the bands are very, very durable. I've been abusing them pretty thoroughly and they haven't shown any wear on them. We've done pull-aparts, band-resisted pushups, band curls, band pushdowns, and a few other exercises. They've put up with it without a problem,
Quality: 5 out of 5. These bands are well made and stand up to a lot of punishment.
These are temporarily out of stock, but I'm sure they'll be back. If you need a very light band, these are the way to go.