The hour glasses with sand 60 minutes antique have achieved the highest quality ±5% industry standard in the USA. So this vintage sand timer is very durable and can provide a lasting service for you in your daily life and work. Made of premium metal and high borosilicate glass, filled with different color solid sand. The 15 min sandglass timer makes it easy to track your work, measure your progress. Suitable for wedding, graduation, housewarming, and birthday gifts.