The Tulsa bar stool includes a USA made 360 degree swivel. The frame is made of welded chrome plated steel and comes from overseas. The metal pan that goes around the side of the bar stool seat is made of chrome plated steel and comes from overseas. The actual seat itself is manufactured and upholstered in the USA. The final assembly of the bar stool will also be done in the USA. This unit ships fully assembled. The diameter of the seat is about 15 inches.