Designer Banu Demirel says, "The number of strands used gives different effects with Blackwork designs. You can use two or more for a thick, rich look. These bolder lines will enable you a 3D look when combined with one stranded lines. I would highly recommend to experiment with variegated or overdyed floss as well as adding color to designs with solids according to your taste." On 28 count fabric, the width of each bookmark varies between .5" to .8" with a height of 5.5". 2 skeins of floss is required when 1 strand is used over 2.