1.Envelope used for business,gift,invitation 2.OEM size, design 3.Different material gram of paper ... envelope bag with different materials and designs!Peel & Seal Colorful Invitation Envelope 1) Materials: white paper, kraft paper, coated paper,art ... paper card,gift box,printing gift box,PVC/PET/PP transparent boxes,braille printing,self-adhesivestickers,paper bag,screen guard printing ...