This metal detectable, x-ray visible and anti-microbial fine tip marker is the most suited for writing on labels and shiny/greasy paper. Performs well in cold and frozen applications witha temperature range of -4 to 140°F. Cap is made of metal detectable plastic and has a magnetic clip attached for extra security. Please note that due to the nature of the ink used, without the cap the ink will dry out. Blue housing. 10/pack.