Two different sizes available. Using Lil Twister Ruler Item LILTWISTER for 5" charm squares. will yield approx a 38" x 38" wall hanging. Using Primitive pinwheels ruler Item PRI946 includes a free pattern for 3 12" squares will yield approx a 47" square. The scrappier your squares, the easier it is to assemble the twister blocks. Keep values fairly close so image is still discernible.