Purple Frixion 0.7mm FR7 Rollerball Pen The Frixion 0.7mm 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 FR7 pen has a stainless steel tip and carbide ball for precision and reliable usage. Brilliant for crosswords, Sudoku and other games. The 0.7mm tip draws a 0.35mm line. Not to be used for signatures, legal documents, examination papers or other documents where writing needs to be of a permanent nature.