Most sizes of ALIENS are narrower than other similar sized 4-cam units! Patented internal spring construction allows placements where even most 3-cam units won't fit - like in pin scars, pockets and mini-huecos. Flexible single cable permits ALIENS to be slotted deeper and "walk" less than other camming devices. ALIENS rack well and are famously easy to place and come equipped with a 6" ULTRATAPE sling. Each ALIEN cam holds true to the orginal CCH design (with improvements - like the flexible trigger control cables) and are UIAA certified and CE approved. Be sure to place your ALIENS (and all cams) at 50% closure - for maximum holding strength. Made in Spain.