Robust & DURABLE: Hourglasses are made of durable, clear acrylic. Therefore, the most suitable timer for childrenDevelops understanding of time: The hourglass is a visual tool to grasp the concept of time and helps children understand transitions within their routines Convenient and easy to use: This functional hourglass is easy to carry and can be used for spinning, completing a puzzle, reading, cleaning, brushing teeth, taking a break and doing classroom activities .GIFT FOR EVERY OCCASION: Timer clock is a classic gift idea for your grandkids or loved ones on their special days throughout the year. Please note that this hourglass is not a precision device, so there is a little time deviation Satisfaction: We provide high quality products and excellent service. If you have any questions about our products or are not satisfied, please do not hesitate to contact us