You no longer need tape, staples, or push pins. The Quick Stick™ line is self-adhesive, sticking to most smooth surfaces like wood, metal, even painted cinder blocks. The letters come down as easily as they go up—without damaging your walls. And, the best part is...they can be repositioned over and over again. There are precut squares, which contain 45 letters, each approx. 3" x 3" .