I picked up a package of graduation thank you notes for each of my two sons who graduated this year. Both sons were very frustrated when they tried to write on the slippery material that the cards are made out of. We could not find one pen that would continually write on these cards. I had addressed and stamped all of their envelopes for them, and we ended up tossing out these slippery notes and buying new ones. We could not find other thank notes with the same small size envelopes as these, so I had to remove stamps and readdress all the envelopes. Do not buy these cards!