blank colored 4-up postcard paper by desktop publishing supplies - 25 sheets / 100 postcards pack - printable with laser or inkjet printer - usps approved size - plain matte cardstock (bright yellow) desktop publishing supplies, inc. desktop publishing supplies, inc. brand 4up postcards are designed to make it simple, efficient, and affordable to create your own postcards from your home or office printer. 4up postcards are laid out evenly on an 8 1/2" x 11" sheet of paper and measure 4.25" x 5.5" each. our postcard sheets are microperforated with 72 perforations per inch for clean edges and easy separation. these postcard sheets are made from a 65lb cover cardstock (176 gsm) and are colored on both sides. inkjet & laser printer compatible. <b>25 sheets / 100 postcards</b>