I had one piece bars made of aluminum , welded by professionals but then it broke. I don't want to sell aluminum because I can only go to professionals to weld which cost a lot and soon , I will break or bend. Also , the cost of it being welded by a pro , my customers are paying for it and the bars can break more easily. This may make things seem like I am expensive and bad.
Buffs are made of aluminum because they can be easily replaced when broken and do not need replacement of the entire bars.
Among the materials often used to make scooter bars ( aluminum , chromoly , steel ) , steel is the heaviest but the cheapest. It is easy to weld and is stronger than aluminum , same strength as chromoly but heavier( I think , not 100% sure ).
Anyway so I am probably going to do steel bars as they are cheaper and stronger.