This is a REFILL for the Pilot Frixion Gel Pen in 0.5
The Pilot Frixion Ball Slim 0.5 writes in a bold erasable Ink due to the heat produced from the friction of the rubbing of the eraser. Ink is thermo responsive/sensitive and it is highly recommended not to leave anything written in this ink in a heated environment (i.e. hot car). Also not recommended to be used on papers that may come into contact with heat during processing such as (but not limited to) mailings, cheques, etc. Erased ink can also reappear in -10C degrees.