If anyone is interested in these binders, my advice is to save your money.
At under $10 (I paid $9.60 with free shipping since I have
Amazon Prime) I decided it was worth the gamble. Both the binder and slipcase are made of a very lightweight cardboard covered in an alligator pattern embossed paper. They actually don't look bad, they just feel cheap. They use a cheap 3-ring mechanism which is riveted through the cardboard in only two spots. I put 25 Vario pages in it and they don't feel too secure. I'm sure if you loaded it full, the rivets would eventually pull right through the cardboard.
I'll put it to good use, but I wont be counting on it lasting too long.