Description Durable and Safe Materials: The hourglass is surrounded by high-quality acrylic and hard plastic materials, which are must-have home decorations. The interior glass is lead-free, chrome-free and mouth-blown. GREAT TIME MANAGEMENT TOOL: Helps your child do things more efficiently and develop a strong sense of time. Great for kitchen, classroom, play time, practice time (yoga or mental training). Set of 4 hourglasses: The set includes 6 pieces of 5 minutes, 10 minutes, 15 minutes, 30 minutes timer to meet your different needs. Accurate and reliable, these hourglasses track time consistently with an error rate of +/- 10%. We strive to ensure that every hourglass is the same? Time is exactly like time itself. Perfect Decoration: This hourglass is a good choice for your mantel, desk, coffee table, bookshelf, antique cabinet and coffee table or as a personal collection. It is also very suitable for children's cooking, games, sports, rest, exercise, learning and self-control, a good idea to help children establish the concept of visual time. With its crystal-like appearance and the smooth sand flowing in the hourglass, you can see the time clearly as a beautiful piece of art. The outer layer is made of rigid plastic and the inner layer of double-protected glass. Besides, the hexagonal cover is strong and hard, very strong and not easy to break. If your kids use these hourglasses and moms don't care, you can rest assured. It is very suitable for ordinary children to brush their teeth, learn to cook, play sports, play, etc. Especially to understand the concept of time from this perspective. It can also be used as home or office decoration. A very good gift for your children and friends. Characteristics : Materials: plastic + glass + colored sand. Time: 5/15/30 minutes. Dimensions: 13 x 5.6cm.