When you wind it up, a regular spool will add a certain amount of tension, so the upper thread will crush the bottom of the wound and the lower thread is prone to convex concaves. It is also easy to wrap around loops, and it often gets tangled in the middle if it is not untied carefully. Dynamai Shimam eliminates the unique imperfections of this winding thread. The special spool formula and coarse special line roll system allows for use with almost no looped fuss and remains uniform until the end. This line is a favorite by many anglers in big game. For natural environmental protection, the spool is made of paper. Super Harris for big fish Thread gouge, tangle-free and high uniformity. Perfect water generation, water color: crystal; Size: No. 30; Connection/Single item; Line volume (m): 164.4 ft (50 m); Processing: Special resin processing SRP; Feature 1: Material: Nylon; *This product is double as a physical store, so there may be cases where it is not in stock. In that case, we will send you an email to inform you whether there is stock, or the delivery date. Thank you for your understanding.