Anti-snap Promise Made of the highest quality natural latex, which is extremely durable, our bands will maintain their resistance for a long time. Each tube band is double layered and carefully constructed to provide maximum resistance. Stackable Up To 150 LBS Stackable bands for adjustable resistance levels. Comes as a set of 5, 48-inch long colored exercise bands. Yellow (10 lbs), Blue (20 lbs), Green (30 lbs), Black (40 lbs), and Red (50 lbs). Bands can also be combined together to provide up to 150 lbs of resistance. Metal clip system allows you to add bands by linking them to the grips, for a more comfortable workout, instead of having to use the bands independently.