This is a set of 5 hard plastic (acrylic) quilt templates for creating the small supernova quilt blocks. The template pieces make a 45 degree diamond - like a star quilt. The elongated diamond block measures 4" across and is 11 1/4" long.These can also be used for a number of other quilt blocks. This set is perfect for using with a rotary cutter. These have the 1/4" seam allowance built in.