1- all diopter from 0.75 to 3.5 available 2- well packed 3- high performance 4- impact resistance 5- light weight The ... be used tegother with the weding glass,it will prelong the lifetime of the welding glass.The diopter are 0.75,1 ... ,1.75,2.00,2.25,2.50,2.75,3.00packing:one lens in one plastic bag, 50 pcs in ...