Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: How long is the blade?
Document: Great, classic knife! I very much like the round handle and the locking blade. The leather sheathe is very nice as well.
blade is sharp and knife is comfortable.carbon steel must be maintained or it will rust.keep dry and cover with thin coat of oil.
Excellent blade quality, stays sharp for days. A simple snd  beautiful design. My first of many to come from opinel.
This knife I added to my collection, more for interest and as a conversation piece than for actual use. The blade is thin and sharp out of the box. Not very practical for an everyday carry and the locking mechanism is very tight and hard to open but it is better than being to loose.
This is a really nice and simple knife. I've never had one that the blade locked like this one. Its simple design, good looks, and carbon steel blade will come in handy around the camp. Another plus is that it is not some cheap Chinese sticker that would last only a season or 2.
Opinel knives are generally good and this one does not disappoint. I keep it in my desk to peel apples etc. A handy size, good blade. The sheath is a bit too short for the knife, and is kind of cheap in appearance but that doesn't detract from the tool itself. I will give these as stocking-stuffer type gifts and keep one in the picnic hamper.
After a few weeks of using this Opinel, i expect its going to be the first of many that i own. Goes through a catfish like cutting air. A light coat of olive oil keeps the blade rust-free. Not something to beat on, but if u need a good knife for slicing through edibles, this is it. I even peeled a few cucumbers and carrots with the spine of the blade, it worked great.
Opinel folding knife is a old traditional French pattern peasant of farm knife. The knife is not fancy, and it is not expensive. Very good steel, very easy to sharpen to a truly frightening edge. Blade is thin, so it makes a poor pry-bar, but it isn't intended to be a pry-bar at all. Knife has no back spring, rotating collar at pivot locks  blade open or closed.
Excellent outdoors folding knife came very sharp out of the box and included leather pouch is a great addition.Highly recommend for any outdoor enthusiast it is lightweight with an old-school traditional build and feel,Makes a great neck knife or just throw one in your pack for back up to good fixed blade.Highly recommend product and seller will be buying again from this store..
This Opinel is still sharp enough to shave hairs off my forearm. The leather sheath is more like a sleeve and will need some modification if you want to wear it on your belt; i punched holes in the sheath for a lanyard and looped that around my belt. I'm surprised i can't find an American made carbon steel pocket knife with a locking blade, but i am sure that if i did it would cost three times more than what the Opinel #8 does.
Answer: no