Don"t be fooled by their diminutive size. These neodymium mighties magnets are amazingly powerful. Neodymium magnets are a member of the Rare Earth magnet family and are the most powerful permanent magnets in the world. One mighty is strong enough to hold 10 sheets of 8 1/2" x 11" paper! These innovative, functional and clever magnets incorporate performance with visual appeal. Like all other Three by Three Seattle products, the 1/4 inch diameter mighties are made with superior materials and are produced according to the highest standards of quality. Available in a convenient set of 8 magnets.