Use multiple bands simultaneously! (i.e., "stackable") These 48" long resistance bands are made from the highest quality rubber to ensure maximum durability. Set includes 5 stackable bands of varying resistance, two cushioned foam handles, an ankle strap, and a carrying case. Multiple bands are able to be used simultaneously, allowing various other levels of resistance up to 72 lbs. Bands clip on to metal attachment of cushioned handles to eliminate hassle of holding multiple handles. Yellow: 2-4 lbs. of resistance Blue: 4-6 lbs. of resistance Green: 10-12 lbs. of resistance Black: 15-20 lbs. of resistance Red: 25-30 lbs. of resistance