Seafriends 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 higher the dash number, the thicker the design stitches. When using our files in the thick density - designs will stitch out "reversible" while still using white bobbin thread.Seafriends clipart is copyright Designstitch.