Integrity cleanroom pens integrity 600 2004 integrity cleanroom pens have a barrel made from high density polypropylene with an anti roll pocket clip they contain only low amounts of sodium chlorides and heavy metals the non smearing permanent ink is compatible with integrity cleanroom paper and notebooks the pens are cleaned and packed in a controlled class 100 iso 5 cleanroom environment and are double poly packed with cleanroom bags integrity 600 2004 cleanroom pens blue ink ster