CCH Aliens are the most popular and narrowest 4-cam units available! Patented internal spring construction on size .5 (green) and above allows closer spacing of the cam lobes to reduce overall head width and placement where most 3 cam units won"t even fit - like in pin scars, pockets and mini-huecos. With a total "head width" of just over 1 5/16" you will be able to venture and place protection of the ALIEN kind in places not previously thought possible. Low profile stainless steel Concealed Control Sheath permits ALIENS to be slotted in tight constrictions without the inherent hang ups that traditional cam units have - with their long, exposed control wires and wider triggers.Ask any seasoned Valley climber to name his favorite small-crack cams, and more likely than not his response will be the Alien. The super-narrow heads and unique cam shapes helped them slip into piton scars and other awkward placements like a hand in a silk glove. When Colorado Custom Hardware ceased production of the treasured piece in 2009, climbers everywhere gasped. But now Spain"s Fixe Hardware has bought the machines and relaunched the Alien with virtually the same design.