ND(Neutral Density) filter Material:Made of optical glass Sizes :37 ... 67 72 77(mm) Models:ND2,ND4,ND8,ND16,ND32 ND(Neutral Density) filter1.This products is used to reduce the ... .4.We owns our owned factory,and specialising in producing ND filter many years,So,donot warry about the quality,and ... don't hesitate to contact us at any time. fader ND(Neutral Density) filter