The Flex Plate Long For G10/G12/G14/Air Tech Crampon Add-On by Grivel. The crampons with either Classic or New Classic bindings now have a new flexible regulation bar for improved fit and performance on walking boots: flexible and elastic it allows the foot free movement without over-forcing or stressing the bar even over extended use. The flex regulation bars are made of multi-ply stainless steel and work just like a car's suspension springs. Note: the Flex Regulation Bars can be used on all of Grivel's crampons. SOLD IN PAIRS.