★Lenght : Appr 52mm , Cartridge Diameter : Appr4-6mm, Bore diameter : 2.6mm
★Package : 30 PCS fountain pen cartridges 【Black】
★Fit standard Fountain Pen such as Jinhao ,Duke , Baoer, Hero and 98% of Chinese fountain pen
★Not Fit The LAMY and PARKER Fountain Pen
★100% Satisfaction Guaranteed : If there is any reason you do not like the pen ,just send us a message ,we can offer you a full refund or replacement !