$39.90 SGD $49.90 SGD
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
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.