The major frame of this rotating retro hourglass is made of zinc alloy,while the base is made of iron. You can choose different colors of sand into the glass. There are 2 sizes for you to choose from. Different sizes have different timings. Eata Gift provides customization service that you can add your logo, pattern, text, or other symbols on the frame top or bottom of this hourglass (Duration 15 min) by laser engraving.