Resistance Training with a Gel/Rubber Stretch Cord?

So, I was getting some equipment at MC sports, when I saw this;
http://www.amazon.com/Perfect-Fitness-Bands-Tendon-Tech/dp/B01DKOFIR2
On sale for $6. Never really used one before, but figured for $6, I might as well try it (alot of the other bands and cords where like $20-$30).
However, other than some simple stretches and curls, not really sure how to use it. Anyone have any ideas, or resources I might look at?

2017-04-11T00:37:33.809Z