A Great Addition to any home school or can be used while traveling.
There are 4 cylinders and each cylinder has 5 knobs varying in height and dimensions.
This is a MINI version of the actual knobbed cylinders.
Size of each block : 15.5 x 4 x 3.5 cm
Block 1: height and diameter of the cylinders
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Block 2: diameter decreases as the height increases
Block 3: diameter decreases as the height remains constant.
Block 4: height decreases as the diameter remains constant.
If you notice any defects within 30 days, we will gladly replace the item. Our quality guarantee also covers workmanship. A sale is not complete until you are satisfied.