The supplied product information does not specify the exact material. This classroom timer features a clear large-digit display for quick reading and supports both count-up and countdown functions. Its maximum setting of 99 minutes and 59 seconds accommodates short exercises, classroom tasks, study sessions, kitchen timing, and longer projects. The compact design is easy to set up and use, making it suitable for teachers, students, after-school programs, sports activities, home use, and educational time-management tasks.