2-minute sand glass, made of durable PVC, ABS, glass tubes, and sand materials, size: approximately 2.4 inches/6 cm in height, 1 inch/2.5 cm in width. Suction-cup spin glass timer for children is a very effective visual signal. When the bright sand floats down layer by layer, it allows them to see the passage of time. Helps children improve concentration and time management. Has a suction cup that can be attached to a smooth surface and can be used simply by flipping it. At that moment, the sand will flow smoothly from top to bottom, thereby improving the child's concentration. Perfect for timing brushing teeth, showering, cooking, games, exercise, etc. It can not only be used as a wonderful decoration for your home and office but also as a beautiful gift for children. This timer is specially designed for games. It is not a precision timing device, so please allow a small timing error. If you have any questions, contact us promptly, and our customer service will provide a satisfactory response within 24 hours.