Personalized Christmas Cards -Santa Claus (Personalized) 30 Cards with Blank Matching Envelopes Personalize the greeting on the inside of the card for FREE! Use Amazon's NEW Customization Tool to Create Personalized Cards. Premium 100# Classic Crest Bright White Cover Stock with blank matching envelopes. 8.5" X 6". Scored but shipped flat in case you want to hand write a personal note. Designed for writing on the inside of the card.