The loops are not tied off by any other way. They are just raised up as you see them. They never unwind. They stay put without "knotting" them so to speak.

I'm sorry, I do not know. I got my wool raw from a local sheep farm and had it cleaned.

Chelsey, it's just latch hook canvas you can get at any craft place. Not sure of the size squares. I bet they are all pretty standard size.

It goes more by weight, not length. Here is an answer I posted previously if this helps: Hello, I am unsure exactly how much roving I had. I stared out with raw from a local sheep farmer and had it cleaned and made into roving. If you are to buy it I would "guess" about 6-8 lbs depending on how big/thick it's going to be. If you order it make sure you will be able to order more in case it wasn't enough. I had a friend who ran out of a certain color and wasn't able to order more

As far as I know, these pads last for years, decades. There are ways you can wash them but I never have. I'll see on if I can upload a pic. But if I can't just know that the pad will last for a long, long time. And sorry, I cannot see where or how to upload a pic.

It can depend on how big or small you make your loops. The ones I have were about an inch and then they compress down.

You just flip it over when you get to the end. If you start watching at 6:30 this is where it's shown how to do this. Every other row is on each side.