Made of high quality Zinc Alloy and carefully selected sand, this timer is of high quality, safe and non-toxic. This hourglass will never contain anything harmful to your health, so you can choose it with great confidence. Beautiful and elegant looks can be used as interior and patio tabletop decorations to add an artistic touch to your home. The gold hour glass 30 minute sand clock meets the industry standard of the highest quality ±10% in the United States. The sturdy 30 minute hourglass helps you easily understand the time changes, adjust the plan at any time, and speed up your progress. As well as boosting productivity, an hour glass timer can help prevent overtime fatigue, and a well-timed 30-minute break can rejuvenate you.