This tactical stylus/pen allows you to select, sketch, draw, take notes and express yourself creatively on most touch screen devices including but not specific to Apple iPadTM, DroidTM smart phones, and KindleTM eReaders. When you wish to use the instrument as a normal pen you simply unscrew the stylus cap exposing the writing tip. The cap can be screwed onto the opposite end of the pen for easy storage. Material: T6061 Aircraft Aluminum Overall: 5.7" (14.5cm) Screw cap pen Uses Schmidt P900M Parker style black ball point pen refill