This listing is for a 50 piece set, which includes:
- 25 heavy cardstock notecards (3.4" x 2")
- 25 embossed, gummed envelopes (4.125" x 2.7")
Gift cards or standard business card will fit inside the envelopes. 
The notecard is cut from heavy cardstock and can be written on with wider tip pens or heavier ink pens (such as a Sharpie, colored markers or gel pen) with no seeping or leaking through to the back.