Safe material: hourglass with suction cup are made of durable PVC, high borosilicate glass and sea heart sand, clean workmanship, quality assurance. Safe and environmentally friendly, non-toxic and tasteless, not easy to fade, strong adsorption, not easy to fall off, durable. Suction cup design: no tools are required to use our teeth brushing timer. Built-in powerful suction cups that stick to smooth surfaces and leave no residue when removed; can be rotated for use. Simple and very easy to install. The transparent design is easy to check and visually remind. Time management tools: the toothbrush clock is a very effective visual reminder to help children do things more efficiently, develop a strong sense of time and concentration and is an excellent and practical time management tool to improve work efficiency. (Note: this hourglass does not measure the exact time and is intended for children to play only) Box contents: you will receive 3 x 3 minutes time hourglass. The colours are blue, green and yellow. The size is uniform 3 x 6 cm; the 3 minute timer ensures that children brush their teeth long enough to clean them thoroughly; enough for your daily needs. Wide range of applications: this time hourglass is perfect for managing children's time when playing, brushing teeth, teaching, cooking, exercising, cleaning and learning. It helps children do things more efficiently and promotes time awareness. Can also be used as a decorative and time measuring tool for your home or office.