A. This screw gasket is made of glass/colored glaze (Note: "colored glaze" is a translation of "琉璃", but for professional terms, the specific English equivalent may need to be confirmed). It has a good quality. There are various specifications available, including gaskets in two different sizes, M5 and M6, which can meet different usage needs. B. It is suitable for mountain bikes. It features a flat washer design and has relatively strong adaptability, making it applicable to relevant components. It is suitable for both men and women, as well as the general public. C. This product is sold in multiple regions such as Europe, South America, Southeast Asia, North America, Northeast Asia, and the Middle East, and has gained wide recognition. In addition, it has an authorized private brand, which demonstrates its reliable quality. D. This is a product with in - stock inventory, which can ensure a stable supply. It is a screw gasket worth considering, as it can provide reliable support for your mountain bike components.