This is a replacement track for:
"3-in-1 STEM Remote Control Building Kits-Tracked Car/Robot/Tank, 2.4Ghz Rechargeable RC Racer Toy Set Gift for 8-12,14 Year Old Boys and Girls, Best Engineering Science Learning Kit for Kids (392pcs)"
https://smile.amazon.com/gp/product/B07TCGYSR9

The tracks in this kit aren't very good. The clips tend to bend, resulting in the tracks getting loose and falling off. These may be lego compatible, as this product is a clear knockoff of lego.

Yes

.2 mm

I used support for the bar and got very good results, but I suspect one could get away without supports.