Features:Resistance Level: Black: 25-65Lbs;Red: 15-35Lbs (optional)Item Size: Black: 208 * 2.2 * 0.45cm / 81.95 * 0.87 * 0.18in (Circumference * Width * Thickness) Red: 208 * 1.3 * 0.45cm / 81.95 * 0.51 * 0.18in (Circumference * Width * Thickness)Looped Resistance BandMaterial: Natural LatexProcess Technique: Nine-layer Tape Casting MethodSuitability: For athletes， sports fans and most body builders.Package List:1 * Looped Resistance BandNote:Please choose the right one for you on the basis of your exercise intensity and bearing capacity.