Template set J consists of 6 parts, to cut the 10 parts of a house block. These are acrylic templates that you can use to cut the fabric with your rotary cutter. The corners are engineered to make the pieces fit exactly, without dog ears (that is why the triangular gable fits the roof exactly). The block size is 6 inch. A bonus of this set is that the gable template can be used to make the Thousand Pyramids.