Abstract: A wireless stylus apparatus for use with a pen computing device having a input screen or tablet for inputting information into the pen computing device. The wireless stylus includes, but is not limited to, a reusable barrel having an open end and a disposable stylus cartridge having a body section and a head section. The head section has a point. The information is input to the pen computing device when the point is in contact with the surface of the input screen or tablet. The disposable stylus cartridge is meant to be releasably mounted in the reusable barrel so that the head section can extend beyond the open end thereof. The disposable stylus cartridge is configured to leave no discernable mark on the input screen or tablet when the head section of the disposable stylus cartridge is in contact with the input screen or tablet. Additionally, A disposable stylus cartridge adapted to replace a refill cartridge used with a typical reusable writing device is disclosed.