Uni-ball Signo RT1 Gel Ballpoint Pen Black Ink Refills， 0.28mm， Set of 4 (Japan import) [Komainu-Dou Original Package]<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"> Refill for Uni-ball Signo RT1 UMN-155-28 </span></li><li><span class="a-list-item"> Ink color: Black </span></li><li><span class="a-list-item"> The diameter of a ball: 0.28 mm. Extra-fine type. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51Ub2k%2BhsEL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31hCA3affEL.jpg" noproxy>