I don't sell and ship heads because it's a PITA. I don't need money that bad. When I have I cut two pieces of 5/8 plywood slightly bigger than the head and sandwiched the head between the plywood with six lengths of threaded rod placed through the holes for the bolts. Always ship individually. Two small packages are cheaper than one big package. You could always roll them in cardboard. Get at least three or four wraps of cardboard and wrap it with duct tape. Write the recipients name right on the tape with sharpie and put them on the bus. Buses are great for bigger things like fenders, rear ends, tires, and the likes.