Our product contains a pen and 26 alphabet and 1-9 number modules. Users can combine various words on one pen, and also can change the combinations at any time as required, so as to meet the needs of personalized customization. For example, a name, company name, motto, and so on can be combined on one pen. Furthermore, the user can innovate according to his own imagination, making the pen unique. Meanwhile, the alphabet module can play the role of anti-rolling. The alphabet modules can be produced in batches. Applying modular thinking to the design of the pen is environmental protection.