Shenzhen Q&D Circuits Co., Ltd. engages in the research, development, production, and sale of printed circuit boards. Its products include multilayer boards, and single and double panels. The firm offers layer boards, density interconnect boards, heavy copper boards, rigid flexible boards, semiconductor test boards, high frequency boards, and metal substrates. The company was founded by Xiao Hua Zhu and Zhen Wu Song on May 31, 2004 and is headquartered in Shenzhen, China.