Paper Mate InkJoy Ballpoint Pen Ink Refill for 300/550 RT， Medium， 3-Pack (1807422)<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"> This is an ink refill for Ink joy 100 series and 700 series ballpoint pens. </span></li><li><span class="a-list-item"> The technology of Ink joy: a unique blend of ultra-low viscosity inks and optimized writing tips gives you crisp， clean lines and unparalleled smoothness. </span></li><li><span class="a-list-item"> The art of Ink joy: a range of sleek and modern pen designs houses a rich palette of vivid ink colors to dazzle your writing imagination. </span></li><li><span class="a-list-item"> Experience Ink joy quality time after time. Using ink refills is more economical and produces less waste than buying pens over and over again. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31zaRhUXaAL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/21XuZegWf3L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/81sCHdMXHVS.png" noproxy>