Only 1/4″ in diameter, Modest Magnets are strong enough to hold 24″ x 36″ posters (or use 6 magnets for even larger sizes). The thumbtacks stick in the wall behind the poster. The magnets sit on top of the poster, magnetized to the thumbtacks, holding it up.
Pack includes 8 chrome magnets & thumbtacks, enough to hang 2 posters or prints. Instructions included.