Race to see how much can be accomplished before time runs out using these colorful sand timers. They are great for games, timed tests & 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 & come with suggested activities. Each timer measures 1" x 3-1/2".