You can record up to 1080p resolution videos with Redmi 6.
Redmi 6 is made of industrial grade polycarbonate material.
Yes, Redmi 6 does have a dedicated MicroSD card slot.
Yes, Redmi 6 does have the FM radio support.
If your budget absolutely can’t exceed the Rs. 8,000 mark, go with the Redmi 6 without any concerns whatsoever.