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".