Petzl Croll L
A larger version of the 2013 Croll, better suited to thicker ropes and those cavers with bigger hands; also possibly novices who are less dextrous than more experienced SRT practitioners.
Large stainless cam for tenacious grip on ropes from 8mm - 13mm. From personal experience, although this caver favours the smaller style of ascenders, nonetheless the old-fashioned bigger cams do seem less prone to slippage on 'nasty' slick ropes; something to consider if expeditioning abroad on ropes that are of unknown quality.
Incidentally, for cavers of the more convex middle section, the wider surface area of the Croll L tends to reduce twisting of the ascender on the central attachment point, allowing it to lie flatter against the body..
Weight 140g, alloy frame, stainless steel cam.