Both of the knives are made from O1 steel, hardened to about HRC 55. This steel and hardness results in a durable edge for the prying and cutting. The knives are hand sharpened, rounded and polished, with no handle, so they can be used under water for backing removal. They are based on a Roger Powell design, and are perfect for lifting covering material, splitting boards, and mechanical backing removal. They can used by right and left handers.  These knives will pay for themselves the first time you successfully lift something without having to do additional repairs. The large knife is perfect for lifting covering materials, splitting boards and mechanical backing removal.  If you are a paper conservator, and normally remove backing material with a scalpel, you will find this knife much more efficient, and safer for the user and the artifact. The rounded, beveled corners allow you to twist the knife when cutting through slips, for example. These knives are also useful for paring the edges of removed spines. These knives are the perfect union of quality, simplicity and functionality.   The set includes two knives and a folding leather case, held together with magnets and protects the blades when not in use. Fully sharpened. Indispensable if you do conservation, restoration, or repair. Set of two with case. O1 Steel, HRC 55. Large: 6 x 1 x .0625" Small: 6 x .5 x .0625"