This design classic needs no introduction the bic cristal ball pen has been a common sight in businesses schools and homes since 1950 it features a durable tungsten carbide ball mechanism and smooth oil based ink for reliable operation in a range of situations the medium 10mm tip is ideal for general writing and sketching while the cap and end plug match the colour of the ink for easy identification this assorted pack of 10 contains blue black red and green medium ball pen for everyda