1/4 inch 1080, differentially heat treated. hollow ground, bead blasted, etched and oiled. OAL is about 9.5 inches, both blades are around 4.5 inches (one is longer than the other)
These are basically bladed knuckles with handles. We had a ton of fun testing them out (punching various things with them) before I did the finish. They work great!
Also, both are also for sale, PM if interested.