2PCS Swing seat with 128cm Chain Swing Set Accessories with snap Hook

Where are these swings made?

Is the chain tensile load limit 250 lb? Or is the users weight limit 250 lb? A 250 lb user can add up to 600lb more due to centrifugal forces

How far do you space the hanger brackets for proper sag in the seat? I see the seat is 26" across so Im assuming 22" separation?

Is this all chain or half chain and rope? thank you