Check what "Therma-Band" product you click on.
I was told by my PT therapist to get a red, green and blue ball, increasing strength.  I bought the red and green at a local store, and they were exactly like the ones at the therapist's office.  I ordered this one, and it was a different color, which meant a different strength too.  Light blue is weaker than the yellow and red Therma-Band brand, while dark blue is the strongest.
Rating: 1 stars