metal beam

I am looking to have two identical metal beams fabricated and need engineering/design. It would look vaguely similar to the attached design, with a central hanging point and then two lateral attachment points that nylon straps can be hung from. The beam would ideally be 10' long and the width between hanging points would be 8'6". Each beam needs to be able to safely hold 2500 lbs. There is a local fabricator who would need to know what size/thickness of steel beams to use.