飞凯材料：公司下游客户基本覆盖了光纤光缆行业的国内上市公司以及知名制造企业

Group 1 - The company, Feikai Materials, confirmed that it provides coating materials for optical fibers and cables, which are essential in the manufacturing process to protect optical glass fibers from environmental impacts and maintain their mechanical strength and optical performance [2] - The downstream customers of the company primarily include domestic listed companies in the optical fiber and cable industry as well as well-known manufacturing enterprises [2]