A visit — yours or an inspector's — is the surest check on a new supplier. Send a date and what you want to see; the request reaches them as an enquiry you can track.
Address
Room 2111, Headquarters Building, No. 1 Gold, No. 108 Huaguang Road, Zhangdian District, Zibo City, Shandong Province, Zibo, Shandong, China