three layers of high quality cast acrylic make up this wonderfully retro time piece. Seeing how late your are to get to where you’re going has never looked so cute! 8x8” (1) AA battery required Caring for your clock: please do not use any chemical agents to clean your clock. it may get dusty or fingerprint-y but both of these can be cleaned with canned air and/or a microfiber cloth. If anything is bumped out of alignment during shipping or if you drop it (things happen!), simply set your clock to an hour on the dot (I like 3:00) and nudge both hands gently into place so they line up correctly. Then, your time should be perfect going forward.