FitChick Booty Band Toned Quick Perfect Home Gym Portable, 3-tension Levels, Black Comes in 3 different difficulty levels: Pink - light, purple - medium, black - heavy Physical therapy proven: The fit chick booty bands provide a perfect amount of resistance to increase balance and stability Pink 0.6mm, purple 0.8mm and black 1mm Best professional grade workout band - avoid inferior bands that are too thin and prone to tearing, fitness demon bands Personal trainers and physical therapists recommend and use our equipment