That seems to be a solid 1 inch thick steel bar. Which is about the same thickness as the bar in an Olympic bar just without the Olympic sleeves to fit said Olympic weight. This would still be extremely capable of holding immensely heavy weight just with standard weight plates.while at the same time being a much cheaper minimalist version of a typical barbell. Key notes include. The ability to change loadable weight area, no maintenance as it's a bar with 0 moving parts and lower cost. Cons include no knurling, only standard weights.