Recommended bow weight: 15-20kg String dimensions are 2-sun extension for [Ren-shin, Jiki-shin, Koku-shin] bows. The original string material is ANGEL's Majesty 777. For the center serving, please use hemp or synthetic fiber wrapped over the base. Fire, sharp objects, and rat's nest (a type of string damage) are prohibited. This product is a loop-type string. Adjust the height by twisting the string. Compared to other manufacturers, this product is relatively low-priced because it is only available as a finished product and has not undergone maintenance. Basically, no returns or exchanges are accepted. Archery equipment Kyudo (Japanese archery) Anonymous delivery