This is a set of 6 colorful hourglasses. It's recommended as a way for children to playfully become interested in time and the concept of time. They can also be used as interior decorations. Each hourglass measures 30 seconds, 1 minute, 2 minutes, 3 minutes, 5 minutes, and 10 minutes. These are hourglasses for interior decoration and toys. Please understand that they do not have the high precision of digital devices before purchasing. *Target age: 3 years old and up* Do not give to children under 3 years old. Time management, stress relief, calming, relaxation, games, birthday presents, parties, Halloween, Montessori, Shichida method, Kodomo Challenge, Gakken