Set of 6 Sand Timers: 30 Secs - 5 Mins Six sand timers: Orange: 30 seconds Red: 1 minute Green: 2 minutes Pink: 3 minutes Yellow: 4 minutes Blue: 5 minutes The timers for the minutes are the same colors as the corresponding colors of the the Montessori short colored bead stairs. The times are not marked on these timers (but stickers are provided if you want to mark the approximate time on each sandtimer, but please make a note of the colors/ approx. times above) The time is reasonably accurate, but the nature of the product means they are not absolutely exact. Dimensions: each timer is approx. 3.5" (9cm) tall