This is a million-strand loop string for Kyudo (Japanese archery). It is a product made specifically for the Koyama series. Used with Ⅱ Carbon and Kokushin. The previous owner used it in conjunction with synthetic strings for 2 months. I shot it about 30 times. It was a very good string, but I'm letting it go because soft loop strings don't suit me. There is almost no fraying. If you wish, I can also apply loop wax from flex. Mercury2 had a fast initial velocity and was calm and easy to handle. I think it would also suit loop string beginners. The serving is wrapped with cotton thread, so it is unlikely to come undone. It didn't come off with 2115. Price reduction accepted. Free shipping. I'm waiting for your questions.