According to the manufacturer, the StregnthCord offers additional benefits of the original SPRI resistance bands. Strengthcords are comprised of a foam handle at each end and four braided SPRI tubes to add durability and help increase performance. The StrengthCord is available in 5 different resistance levels: Level 1 for very light resistance; Level 2 for light resistance; Level 3 for medium resistance; Level 4 for heavy resistance; Level 5 for very heavy resistance.