These are genuine US military surplus Elbow Pads (a set of 2) in ACU Digital. They are designed for the arm to slip through the sleeve of the pads, and then secure in place with the two elastic Velcro straps.
These elbow pads are made by various manufacturers including ALTA, BPE, and McGuire-Nicholas.
These elbow pads have been previously used and issued by the US military, and are in very good condition. They will show minor signs of typical use including some dirt and scratches.