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 312-2, Building 3, No. 600, 21st Road, Baiyang Street, Qiantang District, China (Zhejiang) Pilot Free Trade Zone, Hangzhou, Zhejiang, China