... optional The lenses have PC, PVC optional Four holes for ventilation, chemical splash There are black, white and soft frame optionalThe ... lenses have PC, PVC optionalFour holes for ventilation, chemical splash, sand ART.NO TA93-2LENS PC,PVCFRAME ... instructions(1)As a lens with dirt, available exclusively glasses cloth or soft cotton cloth(2)Prohibit the use of corrosive chemical ...