Build your Catan kingdom to any size with these interlocking border pieces.I bought Settlers back in the days before they included the border pieces in the box. I recently got it back out to play again now that my kids are big enough to play. These border pieces allow me to play any size game, including expansion sets by just using more border pieces. You will need 2 of each corner piece, and as many side and top/bottom pieces as you want.