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. SMTTW has gravity assisted mechanism that makes choosing your ink ballpoint simple and conveniently. 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. SMTTW multicolor pen with engraved grip makes it easy to hold and use conveniently. 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 ball pen is equipped with an automatic pen cartridge, with the pencil filling 0.5mm.