it is card with magnifying function, can be put in books or map sheet,easy to take, widly used for reading maps, news DB228 (Book Magnifier)Material: PVCMagnification:3XLogo Color: any color according to customerSize: 140*70MMPacking:OPP or PVC bagsInner package:200pcsOut package: 2000pcsOut Carton: 48x37.5x18CMG.W:7.5KGS Map magnifier