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 M01, 20th Floor, Building 1, Aosheng Building, No. 1166 Xinluo Street, Jinan Area, China (Shandong) Pilot Free Trade Zone, Jinan, Shandong, China