These refills are Bright color, Quick-drying, Water-resistant and Smear-free<br> It's Asian Standard refills, length is 110mm, length is 110mm, length is 110mm. fits for Asian Standard gel pen and kaco Alpha, Pure, Keybo, Midot, Rocket gel pen etc.<br> If you don't know whether it fits your pen, you could measure your original pen refill.<br>