They look like he's made them himself with a lathe ! Out of billet ? I suppose you could ask him what grade material and look up the yeild strength on the net ! They would be nice if they where strong enough ! I had some proline plastic ones and they were not round when new ! But with them being light the inertia at speed will not be to bad but if they were ally an bent the inertia would be higher and would vibrate the car to bits
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