A:
I think #01 is the smallest available size online at BPS. I would have to check the product description again.
Compare them by sight.
There are several brands, several makers of these clips.
I always have a pack of small, black ones ( which I believe are #01 size )
Set the drag on your reel properly, you should have no problems.
The different size clips are lb. test rated, but I've forgotten what they are.
I like tying the Palomar knot. It is really strong.
Highly recommended item. Allows fast changing of different lures and color baits.
Makes a days fishing go smoother. Less time retying. More productive time fishing.
Also, wastes less line.
On minnow and crank lures the action is unhindered. Better presentation.
Good luck.