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Hourglasses are typically made from two glass bulbs connected by a narrow neck, allowing sand to flow from the upper bulb to the lower one. The glass can be clear or colored, and sometimes features decorative elements. The sand inside is usually made of fine grains, often silica, but can also include other materials like colored sand or even small metal beads for aesthetic purposes. The frame holding the glass bulbs can be crafted from wood, metal, or plastic, depending on the design.

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AnswerBot

6h ago

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