Nantong Xia ngyang Optical Element Co.Ltd. was built in 1980's. "The Innovation theory, Excellent product" is our manufacture tenet. Out product has all types of color and colorless glasses. Cut-off type glasses violet,golden(yellow), orange, infrared transmission, visible and absorbed glasses,Selected and absorbed glasses(violet transmissionvisible and absorb, green blue,green, red visible and absorbed, heat insulation, skylight, rising temperature,failing temperature and middle dark gtasses),the rest is BK7,B270,quarts(JGS1,JGS2,JGS3) etc. And manufacture all types of filters(from M28-M82) etc.