About this item Precise Timer: Made in USA and Imported. The small sand timers combo pack have achieved the highest quality ±5% industry standard in the USA. More accurate than other kids visual timer New Upgrade design: The glass thickness of hourglasses from 1.55mm to 1.83mm. Also, the sand timers set with break-resistant borosilicate glass and protective cover is not easily broken, more Pack of 6 Sand Timers: The sand watch with 1 min timer, 3 min timer, 5 min timer, 10 minutes timer, 15 minutes timer, 30 minutes timer in one kit. The large hour glasses with sand for kids stedents Time management tool: Good idea to Help your kids do things more efficiently and develop a strong sense of time. Each digital hourglass timer with different bright color, looks impressive and easy SuLiao preschool sand timer is made from premium plastic and safe glass, lead-free and chromium-free. You and your children can use it safely