Recommended up to 15kg. Compatible bows are [Ren-shin, Jiki-shin, Koku-shin]. For the center serving, please use hemp or synthetic fiber wrapped over the base. Fire, sharp objects, and rat's tail are prohibited. This product is a loop-type string. Adjust the height by twisting the string. Compared to other makers, this product is only available as a finished product and has not undergone maintenance, so it is relatively low-priced. Basically, no returns or exchanges are accepted. Kyugu (archery equipment) Kyudo (Japanese archery) Anonymous delivery