Pack of 4， Tombow 55691 O3p X-fine 0.3mm Black Rollerball Refills<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"> Pack of 4， Genuine Tombow O3P， 0.3mm x-fine， black ink rollerball refills </span></li><li><span class="a-list-item"> Waterproof fast-drying ink. </span></li><li><span class="a-list-item"> Tungsten carbide rolling ball for unequaled smoothness. </span></li><li><span class="a-list-item"> Won't smear skip or fade. </span></li><li><span class="a-list-item"> Fits all Tombow refillable rollerball pens. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51OXE9J7ZtL.jpg" noproxy>