Please note this is not appliqué, nor is it a traditional satin or fill stitch font. The light and airy “sketch” fill pattern allows for a quick stitch out. The space between each line of stitching varies such that it is more dense at the upper left and lower right for each letter to create the shading effect. The frame is finished off with a triple bean stitch outline. The coordinating Natural Circle Sketch Embroidery font is sold separately: 
http://www.theitch2stitch.com/Natural-Circle-Sketch-Monogram-Font-Embroidery.html