TheFatQuilter, go to the 1st page and it explains all your questions. Each set is 6 blocks, all of the same pattern and you can do up to 6 sets but all of the sets have to be a different pattern. Label each block with your name, you will receive 1 of yours back and 5 more that other swappers have made per set that you send in. Whatever it costs you to mail in a priority envelope to the states is the amount you will have to send tracibug to return them to you. Just read the 1st page carefully and it tells everything that you need to do.