The problem with the tubes is the subjective description. To me this is not a "heavy" resistance (I think I am an average strength man). It would be a lot more helpful if they gave a number in pounds at a certain amount of stretch. I've found the colors used for these bands are not consistent. A red from one company is not the same strength as a red from someone else. I ended up buying the "extra heavy" resistance tube (green) and I don't think that one is necessarily what I would call "extra heavy" but it is probably enough for what I am doing with it. The overall construction seems good and I would give it 4 or 5 stars if it wasn't for the insufficient strength based on the description.Good productI bought this light resistance band after I had my shoulder surgery. It said it was "very light resistance". As it turned out, it was the same resistance as the "light" I already had. It was a different color so I thought it would be a different resistance. I wish all makers of these would color coordinate so we would know what the actual resistance is. I have never used the word "resistance" so many times before in one paragraph. Anyway, the band was fine, just not different than what I already had.As advertised.Tubes were recommended by our fitness coach for core exercises and these have worked very well.This was a replacement for the one I wore out.The new tube is skimpy and doesn't have near the resistance that the old one had.This one is more light to moderate.new body sport products have snapped and broken several times, even though they are new. My advice: do not buy these. When I contacted the company, they kept delaying and asking for tons of info to return a few that snapped. Don't both--look for alternatives.Great quality band. Have used it every other day for 2 months so far and it is holding up great.Only used for a few weeks before the band snapped. Clearly not great qualityTamaño y resistencia adecuada, buena calidad, me gustaría más variedad de colores y mayor surtido en grados de resistencia, para elegir