#KB-120; detail carving blade, (60 mm) 2 3/8" long, .60" wide, .109" thick.
These are the famous laminated Mora blades. There are three layers. The center layer is AISI O1, hardened to 58 - 60 on the Rockwell scale. The side layers are a softer grade of steel for toughness. They will hold an edge like a straight razor, but are not brittle. In fact they bend fairly easily and should not be chosen for uses where this will be a problem. The blades vary a bit due to the polishing process, but are about .106" thick.
New picture to be posted soon. This is only for one blade labeled "KB-120"