The diameter ranges from 12 mm to 60 mm, and the height ranges from 6 mm to 120 mm, compatible with Montessori standards. Let children have a clear understanding of aspect ratio, multiple relationship, and score concepts. Experience rolling, balancing, and inclined movements in physics, observe the center of gravity and stability. Gameplay: "Cylindrical Tower" - Compare who can stack the same number of cylinders the highest. Color Sorting "- Complete the" Rainbow Column "with increasing diameter by color ring. Ball track "- using a cylinder as a track pillar to design the rolling path of the ball. Magnetic levitation balance "- using magnetic attraction and repulsion to suspend a cylinder at a specific height.