The characteristic of "socket cylinder" teaching aid is that it can not only cultivate children's ability to judge the volume visually, but also distinguish the visual memory of height, size, thickness and length, and also learn the concept of distinguishing three-dimensional space. It can also cultivate children's logical, thinking, corresponding and orderly abilities and keen visual observation to prepare for writing and mathematics.

In the socket cylindrical teaching aid, each cylinder corresponds to a socket with the same size. When handling cylindrical materials, children need to find the corresponding socket that matches the cylinder. Any mistakes in the matching process are obvious, either the cylinder can't be inserted into the socket, or it is inserted into an oversized socket and the cylinder shakes. Or the front is plugged wrong, and after plugging it in, it is found that the socket is not enough.