Product Name: Hourglass Material: glass + wood + metal Color: black Product Size: 9.5x9.5x24cm/3.74x3.74x9.44inch Features 1: High quality glass fine sand, thickened protective layer, durable Novel design, unique appearance, smooth and translucent. It is a very meaningful way to educate your child's sense of time. This sand timer is a perfect gift for your lover or friend. Note: 1. The hour glass has a timing error of about 10%, which is normal and higher than the production standards of the hourglass industry. 2. It is normal for sand to hang on the wall or get stuck, which can be relieved by bouncing the hourglass or placing it in the sun for ventilation. 3. The size of the hourglass timer is measured by hand, there will be 0.1 to 0.5 inches of error. Package includes. 1 metal solid wood black sand - 60 minutes