Family Edition Colorful Cylinder Sensory Teaching Aid: Includes four sets of cylinders in red, yellow, blue, and green. Through variations in diameter and height (such as the green set with decreasing height and the red set with unchanged height, etc.), it is specially designed for sensory and mathematics for children over 3 years old Safety and environmental protection process guarantee: Using high-quality wood and non-toxic, harmless water-based paint, hand-polished to a smooth finish without burrs, rounded corners to prevent scratches, and precise cylindrical dimensions suitable for children's grasping, ensuring safe exploration Visual discrimination and logical thinking: Guide children to observe and compare the diameter and height differences of each group of cylinders, arrange them in ascending/descending order, and cultivate visual acuity, sequential logic, and classification abilities Fine motor skills and hand-eye coordination: Grasping a cylinder and precisely inserting it into the corresponding hole or performing stacking exercises, which helps to develop fine hand control, wrist strength and hand-eye coordination abilities Mathematical concept preparation: Through sensory operations, understand relative concepts such as "size", "height and length", "thickness and width", etc., to lay an intuitive foundation for subsequent mathematical learning such as measurement, comparison, and number sequence