This is a product called Techniclick, which is the same type as the Pentel Pianissimo mechanical pencil. This one is made by Pentel for overseas markets. It is a set of three of the same product. It's very convenient because you can advance the lead with the side knock (*ˊ˘ˋ*) The knocking feel is light, and it's very comfortable to use. It seems to have a 0.5mm Pentel B lead inside. ▶︎This was actually sold in stores, and there may be slight scratches or stains on the packaging. It is not suitable for those who are sensitive to such things; if you are looking for perfection, please look for it in an actual store m(*_ _)m Masterpiece / Heisei Retro / Pianissimo Heisei Pop Culture Stationery Set Office / Old / Vintage Nostalgic Stationery / Mechanical Pencil Imported Version Discontinued / Side Knock Type of writing instrument...Mechanical pencil Pen function/material...Fine point Lead/Darkness...B