2 color quilt block comes in the following 10 sizes and densities:22-2 count , 18-2 count, 18-4 count, 16-4 count, 16-6 count, 14-2 count, 14-4 count, 14-6 count, 11-6 count, 11-10 countLead number is the stitches per inch and the dash number is the density. The higherthe dash number, the thicker the design stitches. When using our files in the thickdensity - designs will stitch out "reversible" while still using white bobbin thread.