It may also be a shorter climb with slightly overhung ice. There may be many technical features that require skill to pass or avoid knocking down on your partner. Placing protection can be somewhat difficult. Good experience in placing protection is a must. A full pitch of at least 90 degree ice or a short climb that is extremely technical.
Protection is often bad or difficult to place.
Excellent technique is a must. The quality of ice can be quite poor and requires excellent technique to move pass. Some mixed moves may be necessary on some climbs. It may have long overhung sections that are in danger of breaking off if perfect technique isn't applied. Often it involves extended mixed moves and awkward hooks to move from rock to ice.