Description SAFETY HOURGLASS TIMER: The large color 60 minute sand timer made by friendly high borosilicate glass and plastic material. And each sand watch 60 min has a number of time mark. easy to distinguish which timer for which usage. Size: 5.2 X 2.6 inch NON-BREAKEBLE SAND TIMER: The hourglass outer layer is made of friendly plactic and the inner one is made of glass, which is protected by double layer. And the hexagonal top caps are firm durable, so its more sturdy and secure avoiding moms worry BEST TIME MANAGEMENT TOOL: The sand timers for classroom 60 minute help your kids do things more efficiently and develop a strong sense of time. The 60 minute hourglass can be used for cooking, games, classroom, study, desk office decorative WARM TIP: This 60 minute hourglass sand timer is mainly made for games, which is not a precision timing device, so there is time deviation.Products from GuanGuan's store