["Product Details\r\nCapacity: 0.5ML\r\nColor: Black\r\nInk Color: Black/Blue\r\nLength : Appr 55mm/2.17\"\r\nFit standard Fountain Pen such as Jinhao ,Duke , Baoer\r\nNot Fit The LAMY and for PARKER Fountain Pen\r\n\r\nHow to load the cartridge : \r\nMost of fountain pens come with converter.You need to remove the converter from the black section before insert the cartridges into the same position. \r\nPlease push the cartridges into the black section with a little power until it locks,it will not flow ink if you do not insert it properly.\r\nIt may takes about 5-20 minutes for the pen flowing if you use it at the first for time.\r\n\r\nQuantity: 5Pcs/Set\r\n\r\nSize for manual measurement, there may be a 0 to 2 for cm error, belongs to the normal phenomenon.\r\nNote: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\r\n\r\nPackage list:\r\n5 x Fountain Pen Ink Refill"]