These routes require considerable dry tooling (modern ice tools used on bare rock) and are climbed in crampons; actual ice is optional but some ice is usually involved.
M1-3: Easy. Low angle; usually no tools. M4: Slabby to vertical with some technical dry tooling. M5: Some sustained vertical dry tooling. M6: Vertical to overhanging with difficult dry tooling. M7: Overhanging; powerful and technical dry tooling; less than 10m of hard climbing. M8: Some nearly horizontal overhangs requiring very powerful and technical dry tooling; bouldery or longer cruxes than M7. M9: Either continuously vertical or slightly overhanging with marginal or technical holds, or a juggy roof of 2 to 3 body lengths. M10: At least 10 meters of horizontal rock or 30 meters of overhanging dry tooling with powerful moves and no rests. M11: A ropelength of overhanging gymnastic climbing, or up to 15 meters of roof. M12: M11 with bouldery, dynamic moves and tenuous technical holds.