The designers at Monteverde USA are pleased to introduce the latest in our versatile line, the Quadro 4 in 1 multi-function pen! A modern and minimalist take on Montverde USA?s previous Quadro line, this pen stores three ink refills, a 0.5mm lead pencil, and eraser all in one. Once you use this unique and subtle pen, you?ll never want to be without it. Stored within the durable brass barrel is a gravity assisted mechanism that makes choosing your ink ballpoint simple and convenient. Simply hold the pen at a 45 degree angle, rotate the pen in hand till the desired color is face up and press the thumb advance button. To retract and choose another refill simply depress the thumb switch located on the clip. To access the eraser just pull the thumb advance button. With an engraved grip that makes it easy to hold, the Quadro is a pleasurable to use as it is convenient. Available in 4 distinct colors: matte Black, stunning Silver, reflective Copper, or buffed Brass. Each pen comes with black, blue, and red ink refills as well as 0.5mm lead. This eye catching pen has everything you need for on-the-go writing, business, teaching, travel, drawing, and more! To replace refills, simple unscrew the grip from the body and gently pull the selected refill out. Replace with a new refill by looking down into the barrel and carefully pushing the end of the refill back into the selected circular chamber. To refill lead, pull gently pull the pencil mechanism out, insert the lead and carefully insert pencil back into the specific chamber. Each ballpoint pen fills with Monteverde D1 refills, pencil fills with 0.5mm lead.