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No. 168, Konggang 2nd Road, West Airport, Shuangliu, Chengdu, Sichuan, China (Mainland)
neutral density nd4 filter for camera lens, US $ 10 - 10 / Piece, Sichuan, China, YOPHY, YP-Nd-021.Source from Chengdu Yafei Optical Instrument Factory on Waimaotong.com.