Paper Dimension : Each package includes 100 sheets of thick blank index cards, measures 3 x 5 inches in size, 230 grams in weight, and the paper is made of FSC-certified paper; Perfect for printing your own photos and keep happy moments forever bright Printer Friendly : Sturdy and versatile, our thick notecards is compatible with most types of inkjet, laser printers and photocopy machines ; Please check your printer manually to be sure your printer can handle their size and weight Premium Quality : This heavyweight cardstock is easy to write on or stamp using pens, pencils, permanent markers, highlighters and many more ; Excellent for thank you cards, homemade Christmas cards, index cards, note cards, flash cards, recipe cards and more Elite Design : The small flash cards are unlined and are blank on both sides ; They are matte, but have a smooth finish ; Very handy and versatile it is perfect for school, home or office use ; Ink stamps and markers do not bleed through to other side All Occasion Cards : These printable postcards are great for taking notes, making flash cards, making your own mail-able postcard, business cards, recipes and lists, and many more methods ; Also excellent as visual aids, study cards and in organizing files and arts and crafts and many more Goefun heavyweight 3 x 5 cardstock are made from an 80lb cover (230 gsm) cardstock and are a 98 brightness rating.These are flat cards with no score, precisely cut for clean uniform look, which means they aren't designed to be folded. The index cards are thick enough that ink does not show through to the other side when using a felt marker. Stiff and thick enough to actually feel like an index card that will hold up with some use, but still thin enough to go through your laser printer.Nice heavy weight to make notes and reminders on that hold up under use.Perfect for crafting your holiday cards,name tags, mini flash cards, custom autograph framing piece and more!