... for optical instruments 4.best service Optical glass raw materialsLB series: LB1,LB2,LB3,LB4,LB5,LB6,LB7,LB8,LB9,LB10 ... materials can make all the coloured glass filters,we can do the OEM orders,just need to tell us the size ... and thickness.Any questions, feel free to contact us. LB series optical glass raw material for sale, glass manufacturing raw material.