Amazon.com.au:Customer reviews: POWER GUIDANCE Pull Up Assist Bands - Heavy Duty Resistance Band - Mobility & Powerlifting Bands, Perfect for Body Stretching, Powerlifting, Resistance Training - Single Band & Set
I used them primarily for pull ups, I got the full set and because I'm not strong I combine the green and the purple for assisted pull ups. I'm about 71kg and I still get a workout with them. If anything, I should probably get the higher resistance ones as I still struggle with the combined bands! But they're wonderful quality, no tears so far. Very happy.