I need help for a tank drive

Ok i am needing some suggestions for my robot that i am making. My robot can only be 1 foot by 1 foot and i am making the drive train a tank drive train. Any ideas?

What is the robot for?

those are some tiny size constraints.

I’m assuming this is probably for a class, and I would just ask what the objective is. ( I know a tank drive is cool but it is rarely the best)

I would use Wheels instead of tank tread. Tread is slow, and can skip or break if tensioned incorrectly.