Photoresistance 1.Many series in our factory 2.Lower Price 3.Quality is excellent 4. ... , photosensitive components, cds,rohsOur factory concentrate on this products more than 20 years, there has many types, 3mm, 4mm, 5mm,7mm, 12mm ... , 20mm, 25mm and many others series. The material is Expoy, Metal shell, Glass shell. ...