Sense-of-Timer was not designed to provide exact countdown times, but rather as a visual sense of passing time. The Sense-of-Timer is ideal for self-governing activiity periods , games, exercises, discussion groups, tests, rests and more. Hour glass shape guarantees a smooth and complete flow of sand contents. High-impact plastic construction makes this timer able to endure drops on the floor. Set of 6; one of each time and color - 10 seconds red, 1 minute yellow, 2 minute blue, 3 minute green, 4 minute violet and 5 minute orange.