Race to see how much can be accomplished before time runs out using these colorful sand timers. They are great for games, timed tests and time management. Combo pack includes four timers, each with a different time interval. The red one contains enough red sand to time a 1-minute activity. The blue one contains blue sand to time a 2-minute activity. The yellow one with yellow sand times a 3-minute activity. The green one has enough sand to last 5 minutes. Timers are made of plastic and come with suggested activities. Each timer measures 1" x 3-1\/2".