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 518-1143, Building 1, No. 190-8, Xinghai South Road, Chongxian Street, Linping District, Hangzhou City, Zhejiang Province, Hangzhou, Zhejiang, China