Wooden
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SKU: 44791
SKU: CW50633
SKU: 44703
SKU: ME05243
A set of four hourglasses that measure the following distances in time: 1 minute, 2 minutes, 3 minutes, and 5 minutes. They can be used to explain time and how quickly it passes, as well as to perform mathematical calculations based on time.
SKU: CW50609
SKU: CW20255