Adjustment of the center of gravity position of the gel pen by the threaded screw structure
The copyright of this work belongs to 王行健. No use is allowed without explicit permission from owner.
New user?Create an account
Log In Reset your password.
Account existed？Log In
Read and agree to the User Agreement Terms of Use.
Please enter your email to reset your password
Hello, kindly remind me that there is a brand pen on a treasure. This year's new product is very, very similar to your idea. Check it out.
Ask what's the use of adjusting the center of gravity🤔
Wow, that's cool, isn't it
Have a sense of design
Have style
Simplicity