The FriXion Ball 4 multi pen has a cool, modern look, featuring a subtle geometric dot pattern on its shiny pen body. This retractable multi pen contains Pilot's popular FriXion inks in four colors: black, blue, green, and red. The thermosensitive ink can be erased by using the special rubber "eraser" at the end of the pen. The pen has a rubber grip for comfortable writing, as well as a spring-loaded clip to conveniently attach to your pocket or notebook cover. Refills are available.
FriXion ink is a thermosensitive ink that can be erased by rubbing. Interestingly, erased ink reappears at temperatures below 14° F (-10° C). A freezer is cold enough to make this happen. Due to the thermosensitive nature of FriXion ink, we advise against using it for mailings, or leaving the written materials in hot cars or in environments that expose them to a lot of friction.