My 6 1/2 x 24 is a must have. I have 2 of them. I also use the 6 1/2 x 12 a lot. I have 12 1/2, 9 1/2 and 6 1/2 squares that are also essentials for me. I recently acquired 2 two inch squares in a box I bought at an estate sale. They are very cute, but I doubt I'll ever use them.