Colour coded for easy recognition, there are two versions with 12mm diameter magnets and a 5 or 6mm diameter axle and two 12.5mm diameter magnets with both 5 or 6mm diameter axles.

• 彩色编码易于辨认，有两种版本的12毫米直径的磁铁和一个5或6毫米直径的轴和两个直径磁体12.；5毫米与5或6毫米直径车轴。