DMM Mantis polyvalent climbing descender is incredibly light at just 45 grams. This is what DMM sais about Mantis. Despite its low weight, the Mantis is a high performance belay device, giving confident control over ropes from 11mm down to a super skinny 7.3mm. Ideal for those looking for a single belay device for all their climbing activities. high performance internal geometry gives greater rope control. Hot forging and CNC technology is used to shape the internal structure of the device to give greater control over a wide range of ropes. This is especially evident when using modern, small diameter ropes. two friction modes for varying applications. In its standard orientation, this device gives confident control over a wide variety of rope diameters. It can also be flipped 180 for smooth abseiling on thick or low stretch ropes. A few grams here or there may not sound like much in the scheme of things, but it soon adds up, and anyone who is making an effort to reduce the weight of their hardware is going to appreciate the lengths DMM have gone to here. Instructions.