reggie98 and [user]TimMiller[/user] are both incorrect. The registered trademark product Speed-Rail® specifies only the fittings, not the pipe.
From: http://www.hollaender.com/files/1/Tech_Data/tech_faq.pdf
Note that neither Speed-Rail® nor Kee Klamp® fittings are appropriate for overhead suspension applications.
Whether to use steel or aluminum pipe and what strength or gauge is one that requires careful consideration and consultation with one's rigging vendor.
http://www.controlbooth.com/forums/members/reggie98.html
From: http://www.hollaender.com/files/1/Tech_Data/tech_faq.pdf
Q: What pipe materials can I use with Hollaender fittings?
A: Any metal pipe (including galvanized steel, stainless, black iron, aluminum, etc.) can be used with our slip-on fittings as long as it is sized
properly (see above). Plastic, FRP and thin wall sleaving should never be used unless a reinforcing dowel is also used inside the pipe.
Note that neither Speed-Rail® nor Kee Klamp® fittings are appropriate for overhead suspension applications.
Whether to use steel or aluminum pipe and what strength or gauge is one that requires careful consideration and consultation with one's rigging vendor.
http://www.controlbooth.com/forums/members/reggie98.html