The CS.19 is a Hybrid braided serving thread. The braiding of Dyneema and High Tenacity Polyester enhances the tightening effect in servings that need robust protection and strong grip, like the center servings on all type of bowstrings. It has a diameter of .019, ideal for Recurves, Traditionals and Longbows bowstrings loops. when a stronger, durable and gripper serving is needed. CS.19 serving material are supplied in reusable reels made of sturdy polymer, containing approximately 75 meters.