Visualise longer tasks with the Giant 30-Minute Black Sand Timer | At 16 x 85 cm and colour coded black, this Timer is ideal for timing extended activities, games, or classroom management sessions | Its strong glass timer is Housed in a protective acrylic tube, and the hexagonal ends prevent it from rolling off desks | Suitable for ages 3+, it's a practical addition to any classroom Educational Benefits: Helps students understand longer periods of time