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Shock- Resistance Sand Timer:Made of Durable PVC, high borosilicate glass, sand and protective cover,which allow sand glass timer not easy to be broken, very durable to use. Widely Used:Deal for Games, Classroom use, Cooking, Exercising,kids' tooth brushing (toothbrush)timeout toddlers play and so on. Also can be used as a decoration. Great Gift for Children and friends. Use Notice:This sand timer is not a precision timing device, so there is time deviation. What's more, please don't use anything to scratch the words on the glass to prevent the words drop off. Warm Tip: 1. Glass will be fragile under a sharp blow, carefully placed. 2. As the timer can not replace mechanical clock, please allow +/- 10% deviation. 3.The sand is powdery. Please allow it get stuck or adsorbed on the glass. Just leave it to dry in the sun or shack it. 4. Under adult supervision when little child under 3 years old Package: 1 X Sandglass