This is camera dolly track, used by professional videographers and filmmakers.
Manufactured from 1-1/2 inch 1010-alloy cold rolled welded tube. After all fabrication processes, track rails and other components are chrome plated to maintain smoothness and help protect against the environment. Cross members are replaceable if damaged.
Four sections of this 90° curved track, placed end-to-end, will form a tight circle 10 feet in diameter.
Note: Do not combine two types of track -- Heavy Wall, with StartTrack. Bumps formed between joined sections will result in jumpy images.