100% Natural Latex Imported Different color adjustable resistance bands: Yellow (10 lbs), Blue (20 lbs), Green (30 lbs), Black (40 lbs), Red(50 lbs). All Whatafit exercise bands are 36" in length, and can be used alone stacked in any combination to a maximum equivalent of 150 lbs. Multifunction and portable: Our resistance bands can apply to different types exercise. Good for toning your arms, shoulders, chest, glutes, legs etc. Also comes with a convenient travel pouch! You can also take your bands to Gym, Office, etc. Good quality materials: WHATAFIT Resistance band is made of natural latex is kind to the environment.