These are fantastic.

I bought these at Wal-Mart. It is great as you can try it before you buy. With all 3 bands attached I could raise my arms all the way up but with great difficulty.

My guess is that Black is 20-30 pounds blue is 15-25 pounds and red is 5-15 pounds possibly harder and all 3 are 50-60 pounds easy compared to free weights.

I am using these for P90X and I generally don't go above the black one drop to the blue one and then go down to 15 pound dumbbells after that.

These bands are very serious especially considering that any other store bands I have tried have had minimal resistance.

The handles themselves have been very comfortable so far I just hope they hold up.More detail ...