This device is bound to save lots of time and produce a first rate stitching job on leather and other heavy duty materials that can be a problem to hand stitch. An internal bobbin feeds out a heavy duty was thread to make sewing seams on leather hunting bags, buckskins, rifle cases or what have you a cinch. Easy to operate, comes with a complete set of simple instructions. With very little practice anyone can sew leather like a professional. Should work well with artificial sinew also. Stitcher comes with bobbin filled with was thread and two needles.