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
F. 21, B. 2, Haixia Yungu Tech. Park, No.98 Shuangzha Rd., Jianye Dis., Nanjing, Jiangsu, China 210019