Jinhao Fountain Pen Ink Refill Cartridges Set of 30 PCS Black Color International Standard Size<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Lenght : Appr 51mm ， Diameter : Appr4-6mm </span></li><li><span class="a-list-item"> Fit standard Fountain Pen such as Jinhao ，Duke ， Baoer and Hero </span></li><li><span class="a-list-item"> Package : 30 PCS Cartridge </span></li><li><span class="a-list-item"> Not Fit The LAMY and PARKER Fountain Pen </span></li><li><span class="a-list-item"> 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 ! </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41otrDD2GFL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41hTbAJdyWL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31LV4JzMomL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41fhpTJKYZL.jpg" noproxy>