Shanghai Precede One Way Vision Material Co,Ltd,located in bustling metroplis,Shanghai.Precede company has been committed to study one way vision film, and successfully developed the exclusive technology which is different from the traditional ones,it is the only one domestic enterprise won the produce authorization of invention patent for OWV,(Patent NO. is ZL2005 1 0020 198.0). Precede company has successfully transformed the patent into the achievements and achieved great success. Welcome to contact us by precedesale66 at yahoo dot com