We are a Chinese optical products manufacturer, we can provide products as following: (1) glass aspherical lens:(2)spherical lens: Diameter-200mm(3)projector lens: F80-290mm(4) multiply coating: Wide-band increased transmisson layer, high reflection reflecting layer(reflection more than 90%), wave-band filter(5) prism(6)plastic lensAlso we have a agent for series of Precious Compoud Contact Metal of a large leading manufacturer of electrical alloy product If you want to know more details, please contact us.