Knife Blade Edge Guards.
MESSERMEISTER invented hard plastic Edge-Guards that fit any knife. Edge-Guards by Messermeister have been recognized as not only the original edge protectors, but also, by far, the finest and most functional.
If you don't have your knives in a block, edge guards are a must for any knife that you'd like to take care of.
Most culinary schools require students to have a protective sheath on knives when they are not in use.