Heres an item that checks all the boxes.

A rollerball pen that needs no cap. A smooth, clean flow of ink. But what is absolutely unique - a clip that retracts completely for extra writing comfort. The LAMY swift - a great new slant on a fine old art. In the writing position, the rollerball is extended and the clip retracted for greater writing comfort. When the rollerball is retracted, the clip is raised so the pen can be clipped onto a jacket pocket.

Heres an item thats both functional and fun.