This is a Pentel EnerGel pen body and refills. I'm selling these because I've changed the ink tip size I use daily and no longer need the ones I previously purchased. The pen body originally contained a 0.4mm tip, but the ink currently loaded is 0.5mm "Black." I looked for a body labeled 0.5mm but couldn't find one, so I apologize that the body's marking doesn't match the installed tip size. The refills are all 0.5mm "Black." One refill has been opened because I mistakenly opened the wrong size. Due to the opened refill, the product condition is listed as "Like New."