These strong little refrigerator magnets won’t budge! They hold fast, and keep your papers & photos securely attached to any magnetized metal surface. Each pack contains 10 magnets, 8 small squares (almost 1" x 1") and 2 large rectangles (1 3/4" x 3/4"). The Opti-cool set depicts different optical illusions in a variety of colors. Give your fridge or bulletin board some style!