1st Birthday Disney Cars Thank You Cards 24pk. One 8 count package of 4.25 in x 6 in Cars 1st Birthday Thank You Notes, with 8 envelopes and 8 seals. Let your guests know how much you appreciate them with our friendly Cars 1st Birthday Thank You Notes. These postcard-style thank you notes feature Lightning McQueen on the front and six blank lines for a personal message on the reverse side. Also included are 8 sticker seals featuring Lightning McQueen, Tow Mater, and Luigi, so you can seal up your envelopes in style. Be sure to send your guests a photo from your little one’s Cars 1st Birthday Party along with your note!