This is a pack of 5 resistance bands. There is also a information guide. Along with a handy carrying bag. Each band has a different tension. There is x-light (15-30lbs), light (15-35lbs), medium ( 30-50lbs), heavy ( 40-60lbs), and x-heavy ( 45-70lbs).
My son has been using these a lot. He had foot surgery so hes immobile for months. He needs to build up his arms so he can wheel himself around.