65lb white 4up postcards - desktop publishing supplies, inc.tm brand (250 sheets / 1000 postcards) desktop publishing supplies, inc. desktop publishing supplies brand 65lb white 4up postcard sheets make is simple & affordable to create custom postcards from your home or office printer. these high quality postcard sheets are microperforated with 72 perforations per inch for easy breaking apart and cleaner edges. our blank white post cards are created to work with the industry standard 4up postcard layout- making them work with virtually all design software! each postcard measures 4 1/4" x 5 1/2". these postcards are made from a 65lb cover (176 gsm) bright white cardstock that is both inkjet and laser printer compatible.