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
6th Floor, Building 2, and 5th Floor, Building 3, Sanli Industrial Park, No. 4 Jianshe Road, Lijin Community, Hangcheng Street, Bao'an District, Shenzhen
