Lowest Price Guarantee: A project to offer prices lower than other sites. Get a great deal on popular Frixion refill ink when you buy in bulk! Buy 10 packs! Pilot Frixion Ball Refill 0.5 0.5mm, 3 refills per pack, 10 packs Please let me know if there are any changes. These are 0.5mm refills for Frixion multi-color ballpoint pens and Frixion Ball Slim 05. They are not compatible with the Frixion 2-color retractable ballpoint pen. Product Description for Frixion Refill (for multi-color) 0.5mm Pilot: These are replacement ink cartridges for the erasable Frixion ballpoint pen. After the ink dries, rub the writing with the rubber eraser on the back of the pen body to make the color disappear! The color disappears due to friction heat, so there are no eraser shavings, and you can rewrite in the same place as many times as you like. *Cannot be used for official documents or addressing envelopes. Compatible pen body model numbers are LFBS-18UF, LKFB-60EF, LKFB-80EF, LKFB-150EF, LKFB-2SEF, and LKFB-3SEF.