Small and amazon cheap. I did not want to go all in on these because the good ones are crazy expensive. Better than nothing to fill some unused space under the retrax cover box. Looks like 4 will fit stacked so I ordered two more today. Then I will figure out the best way to strap them down. If I find I use them or break them, I will explore changing to something better. Anybody else carry or used track boards before?

what are they supposed to be used for?

Used and abused them. They have numerous uses, but mainly for added traction when in sand, mud, snow, etc. they can also be used to make a ramp to climb something, makeshift bridge, or to change a trailer tire. Also, lots of guys carry a few straps to secure them to the vehicle for use as a ski in the rare occurrence you break a ball joint or completely lose a tire you can limp the vehicle back home.

Keep in mind, freezing cold and sitting in the hot sun makes them very weak.