Bilila 25 PCS Jinhao International Size Pen Ink Cartridge Black for Fountain Pens Quantity: 5pcs/Pack, 5-Pack ; Ink Color: Black ;Capacity: about 1.2ml / piece Specifications: gall ink maximum about 51mm  diameter of about 7mm Product packaging: separate ink gall 5 pieces in 1 small box Scope: daily writing International Size Cartridge Compatible For Fountain Pen