Sign up for
Participate with your entry in one of our professional or student awards.Sign up for an award
You are using an outdated browser. Please upgrade your browser to improve your experience.
When we write with the pen overed opaque case, we always don’t know how much ink still remains inside. But now using the Core reminder, when another ink color appears while you are writing, it indicates that the ink will exhaust soon.
TA-CHIH LIN YI-YING CHEN