Silver Wall Mounted Melting Clock with Inner Cogs Exposed Each Melting Clock is made from plastic. Each has a distorted face with a domed plastic front & the inner workings exposed. (The inner workings are just for decoration, they do not move or power the clock.) On the back is a standard plastic mechanism which requires 1 AA battery (not included), & a hook for wall mounting. Each clock is priced & sold individually & comes packaged in a plain card box.