The Quadro 4 in 1 multi-function pen allows you to effortlessly access three different colored ballpoint refills and a precision 0.5mm mechanical pencil, all in one durable and stylish instrument. Available in four distinctive finishes, each Quadro features a knurled comfort grip and spring clip designed to hold tight but slide easily into the pocket. Each pen comes loaded with a black, blue, and red ballpoint refill as well as 0.5mm lead and eraser. This eye catching pen has everything you need for on-the-go writing, drawing, and more! How does it work? Stored within the solid brass barrel is a gravity assisted mechanism that makes selecting a writing mode intuitive and convenient. Simply hold the pen at a 45 degree angle and rotate until the desired color is face up then press the thumb advance button. To retract, depress the thumb switch conveniently located on the clip. To access the eraser, remove the thumb advance button.