These ridged metal-wrapped magnets are 2.75 x 1.75 inches. They have a full magnetic back and can hold up to four piece of paper on a metallic surface. 1 magnet is $12, 2 magnets are $18, 3 magnets are $25, and 4 magnets are $32. Price included shipping within the U.S. In the checkout notes, let me know which magnets you would like!