DIFFERENT RESISTANCE LEVELS: The resistance bands come in 3 different resistance levels, with each color representing a different resistance level. Yellow bodybuilding elastic (15-25 pounds), Red bodybuilding elastic (50-75 pounds) and Black bodybuilding elastic (250-300 pounds). These resistance bands can be used individually or combined to meet your different exercise needs. HIGH QUALITY NATURAL MATERIALS: Made from natural latex; high quality, these resistance bands are safe and odorless, and do not cause allergies. Elastic bands are soft, smooth, stretchy, durable and provide enough elasticity without breaking even under heavy tension. PERFECT PORTABLE POWER BANDS: The power bands come with a free carry bag for easy portability. You can use them at home or at the gym, as well as during vacations, business trips or in any park. Use fitness rubber bands for training anytime, anywhere EXTRA DOOR ANCHOR：The fitness rubber band also comes with a door anchor and a storage bag. Resistance bands are suitable for exercising at home, in hotel rooms or anywhere with a door. The door anchor is larger and more secure, and the resistance bands can simply be slipped into the slot. With these sport elastics you can do various exercises. MULTIFUNCTIONAL: Our fitness resistance bands can be used for warm-ups, muscle relaxation and strength training before exercise. Resistance Bands are designed to help you stay in shape. You can use fitness resistance bands for exercising, stretching, shaping and more.