Rock Star Thank You Cards - Let someone know how much you appreciate them with these wonderful Rock Star Thank You Cards. Thank everyone who attended your party for making it rock! These Rock Star Thank You Cards feature a colorful illustration of an electric guitar with headphones, skull and crossbones and a "Thank You!" message along with a place for you to write a special message. Cards are one-sided and the back side is blank. Includes 20 thank you cards & white envelopes. Approx. 4" X 5.5".