Customer Service?- If you are not satisfied with HPYGN resistance bands set, please feel free to contact us, we will fully refund. And we hope customers to give suggestions for improvement. Different Level of Resistance?- The workout bands is divided into 3 different levels of resistance:Yellow band(Light, 0.35mm), Pink band(Medium, 0.45mm), Blue band(Heavy, 0.55mm).Never worry about the exercise bands too too hard, easily switch between the 3 levels to your preference anytime. Easy to Use & Carry?- The long yoga bands comes with a storage bag, easy to carry anywhere, in travel, home, gym, etc. Simple & easy to use product for upper & lower body exercises that can be performed anywhere, is ideal for conditioning & rehabbing muscles. Great With Any Workout?- People Love it Because it is stretch bands are ideal for assisting in Sports Athletes, Seniors, Physical Therapy, Rehabilitation, Wrestling, Bodybuilding, Pilates, Yoga, Kickboxing, Crossfit and so on. They are also perfect for use by women after birth to keep their bodies in shape. Upgrade Exercise Band?- Each resistance bands measures 6.9 ft long X 6 Inch wide.A superior band product for resistance training and rehabilitation, provides both positive and negative force on muscles and joints, stretches tones and conditions all major muscle groups. Our bands are scent free and latex free without a sticky surface, is ideal for conditioning & rehabbing muscles.