Blurb from Grivel website :
Monster upset the accepted rules about climbing equipment in 2004-2005. Although a bit extreme the Monster concept was appropriate to the era and accepted by the climbing community. That said, Monster is specifically adept on overhanging terrain, therefore not for everyone. Now Monster is complemented by the X Monster, which is a less radical tool featuring a slightly straighter shaft and a grip better suited to vertical and less steep terrain. X Monster’s pick is thinner to improve penetration and make it less destructive to fragile ice features. It is also shorter but due to narrow profile of the shaft (slightly thicker than the pick) the whole head of the tool may slice between icicles or into narrow cracks to reach deep anchor points. Where you expect to see an adze you’ll find a small hammer shaped like a curved nut – don’t expect too much but it will drive a pin or torque in a crack better than nothing. X Monster’s shaft is the same flexible spring steel as that of Monster, which allows those accustomed to it to manipulate the tool differently than one with a totally rigid shaft. This flexibility is generally beneficial, rarely a disadvantage. A hole in the shaft will take a releasable leash and the shaft is finished with a small but effective tooth to allow traction in the piolet canne position. CE certification as a category 2 PPE.