Perfect for 3 minute eggs and other household uses. Great as a game timer! Natural wood base with glass. Measures 4"/10cm tall. Wipe with a damp cloth. A venerable design, that still functions, much more reliably than some newer inventions we might add. So whether you're timing an egg, a naughty child, or your stand mixer, you can rely on this. The sand doesn't lie, and it doesn't require any batteries either.