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
No. 26, Building 33, Area A, Hangzhou Wanpin Auto Parts City, No. 2666, Desheng East Road, Xiasha Street, Qiantang District, Hangzhou City, Zhejiang Province