This item is a pair of kettle drums, radiating magic if so detected, but otherwise unremarkable. 

If either is struck nothing happens, but if both are sounded together all creatures within 7" are permanently deaf and will remain so until a heal spell or similar cure is used to restore shattered eardrums. 

Furthermore, those within 1" of the drums will be stunned by the noise for from 2-8 rounds. 

Each drum is a hemisphere of about 1½-ft diameter.