Wholesale Natural Deer Sinew made from deer back strap (the fibrous band of tissue know as the tendon) measuring approximately 15 to 24 inches long.  Deer Sinew is great for craft projects for restoration and reproduction craft projects.  Sinew historically has been used for sewing thread to make clothing and other accessories (example: bow strings, sewing moccasins, cordage, backing material for selfbows, to attach blade handles and to reinforce nocks). Sinew is very strong when dry, but water can weaken it.  To slow moisture from seeping in, you can coat it in pitch glue.