7 1/2inch L x 4 1/2inch D Nana Bell (With Hangar). NANA BELLS Originally used to keep track of cattle herds, these handcrafted bells are distinctive from any other types of bells from across the globe. Due to a secret family formula that is used to smelt various metals and attaching a hand hewed wood clapper the tune these bells make is uniquely melodic. For generations the formula has been passed on from one family member to the next.