Versatile in its use, classic in its design and construction, Opinel stainless steel folding knives have been carried and appreciated by generations. Locking the blade while opened or closed is easy with the Virobloc safety rings. No. 6: Opinel No6 is the smallest model that features the Virobloc safety ring. This little knife is non threatening and very durable.No. 7: The "in-between" size of the No7 classifies this knife as neither small or big.No. 8: This knife is small enough to be used as a pocket knife and its 3 1/4" blade prevents it from being considered a weapon in most states (please check with your state).No. 9: The No9 is the first of the Opinel's "large" knives. Please review its size before considering it.No. 10: The No10 is a big folding knife that should not be considered a "pocket" knife. Of course this knife has many other uses but please consider its size if you are in the market for a "pocket" knife.No. 12: The Opinel No12 is incredibly durable and weighs less then 4 oz. The wood handle does not transfer heat or cold to the hand. Note that at 11 inches in length this is a big knife; please review it's size before considering owning it.No. 13: The giant. At almost 20" when open, the Opinel No13 is a huge knife and is commonly used as a machete.