Blue Frixion 0.5mm FR5 Rollerball Pen The Frixion 0.5mm Rollerball pen allows you to imply rub out your mistakes with the eraser stud and watch it disappear! You can write over your mistakes immediately with the same pen, no waiting for anything to dry or having to use a different correction pen. The FR5 pen has a stainless steel tip and carbide ball for precision and reliable usage. Brilliant for crosswords, Sudoku and other games. The 0.5mm tip draws a 0.25mm line. Not to be used for signatures, legal documents, examination papers or other documents where writing needs to be of a permanent nature.