DIY Gymnastics bars. I dont remember the exact dimensions but made with pvc pipes & pvc cement, the bar is a metal bar from plumbing aisle, it screwed right into the pvc (then glued) the fabric is felt, it was a long process of tightening, trimming and glueing. I used a flexible super glue
Professionally made gymnastics bars can cost from hundreds to thousands of dollars from gymnastics equipment companies. Building a single bar by yourself may greatly reduce the cost. Gymnastics bars used in gyms are made of galvanized steel, but you can construct a practice bar out of wood materials for use in your home.