The Weapon's characterisitcs appeared to be a bronze fist in the form of a bear paw clenched in a fist, with outlines similar to claws. It's about the size of Clay's own hand, so it fits him as his main weapon.
Like it's old design, the Fist of the Iron Bear grants the user with immense strength in their equipped hand which could pummel with great force. It could also be used to cause a ground tremor by punching the ground. The effect would only work on the equipped hand. But specifically, the the Fist of the Iron Bear was a lefty glove.