S2 steel, the strongest and hardest bits availableSet includes 2 magnetic bit driversHandy carrying caseBall torx for limited access areasBits have a brushed finishVIM Tools offers the first Ball Drive Torx BitsS2 Steel, the strongest and hardest bits available, T10 thru T50 Ball torx Bits, magnetic bit holder and magnetic bit drivers.Plastic case Another VIM Tools Exclusive item U.S. Patent 5,251,521?? TORX is a registerd trademark of the Camcar Corp..