Get a great deal on popular Frixion refill ink when you buy in bulk! ■2600 10-pack bundle: Pilot LFBTRF30UF3L Frixion Ball Refill 0.38mm Blue, 3 refills per pack, 10 packs These are 0.38mm refills for Frixion multi-color ballpoint pens and Frixion Ball Slim 038. They are not compatible with the Frixion 2-color retractable ballpoint pen. Product Description for Frixion Refills (for multi-color and Slim 038) 0.38mm, Pilot: These are 0.38mm refills for erasable Frixion ballpoint pens. They can be used for both multi-color and single-color pens. After the ink dries, the color can be erased by rubbing with the rubber eraser on the back of the pen. The color disappears due to friction heat, so there are no eraser shavings, and you can rewrite in the same spot as many times as you like. This is the finest 0.38mm erasable ballpoint pen in the Frixion series. It is an ultra-fine type suitable for writing small characters. *Cannot be used for official documents or addressing envelopes. Not compatible with the 2-color retractable ballpoint pen.