I bought this set as a christmas gift for my nephew to introduce him to knex. I wanted to get a variety so that he could build more than one project and also have enough pieces to encourage him to be creative. The pieces are different sizes and to the point that you can't connect any of them. You honestly couldn't make a square with the pieces in the box. It was quite a disappointed to him and me to find how useless this is set is. Do not buy.