Here is a handy tool that lets you replicate dumbbell exercises with resistance bands. The AccuFitness Multi-Myo Resistance Band Bar lets you perform bicep curls, chest flies, and more. The bar has a steel core and can handle up to 200 lbs of resistance. The strap rotates 360 degrees.
Multi-Myo 20″ Resistance Band Bar is portable, so it allows you to perform exercises as you travel.