Hatch replica which you can get for US$26.50 for the whole elbow and knee pad set at RedWolf Airsoft. Not a bad deal at all... " Based upon a real steel protective pad system, the 9mm Tactical X-Tak Knee and Elbow Pad is extreme light and flexible yet provides superior protection and shock absorption when compared to traditional pads. 

These sets from Airsoft Park look really similar to Hatch Knee and elbow pads... "Constructed with high quality Nylon, wearable and comfortable, the protection pad is constructed by high quality polymer, protective and durable. It has the special "X" shape design for maximum mobility and protection and high density foam for great shock absorption.