5 years & up. This magnetic demonstration clock helps teach time in a different and unique way, through a number line! Students will be able to recognize and understand that a clock is just a circular number line. They will be able to take the pieces apart as they begin to learn and then put them back together as they advance. Two reversible number lines are included, one for hours and one for minutes. This clock provides an easy way to go from counting to telling time. 13" magnetic demonstration clock includes a clock base, hour hand, minute hand, reversible hour chain and reversible minute chain.