InkOwl - 4-Color Toner Refill Kit for HP CB540A， CB541A， CB542A， CB543A (125A) with reset chips<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"> Includes 4 bottles of Ink Owl® premium formulation toner， 4 spouts for easy pouring， 4 reset chips， easy-seal tape along with detailed， graphic instructions. </span></li><li><span class="a-list-item"> To refill this cartridge model， you'll need to pierce holes. To do so， it is highly recommended that you use a laser cartridge holemaking tool designed for this purpose. The use of any other tool， including a drill， is not recommended to avoid damaging sensitive internal components. You can then use the provided easy-seal tape to seal the holes. To get the tool: http://www.amazon.com/dp/B008J4P5JU </span></li><li><span class="a-list-item"> For the proper functioning of the refilled cartridges， we have included reset chips. </span></li><li><span class="a-list-item"> Our instructions will guide you step-by-step through the entire refill process and include pictures showing you exactly where holes need to be pierced and will show you how to install the replacement chip. </span></li><li><span class="a-list-item"> Includes 55g of black toner powder and 45g of each color for the full 2200-page yield of black and 1400-page yield of color (at 5% coverage) just like the original HP cartridges. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41sRpLIsxlL.jpg" noproxy>