Body-Bands Pro Elite Double Resistance Band Set #4 (Set of 8 Bands) Pro Elite Double Band Set 4 Includes Two Red 1/2", Two Black 3/4", Two Purple 1 1/8", and Two Green 1 3/4" Bands with resistance levels ranging from 10 to 120 lbs. each This a Great Set for Beginners and Intermediates to use for Strength Training, Resistance Training, Isometric Training, P90X, and Pull Up Assistance Each Band has a 41" Lay Flat Length and has a 82" Circular Circumference The Pro Elite Series is Body Band's Premium Line of Layered Loop Bands which are Great for Gyms, Trainers, Fitness Professionals, Athletes, & Hardcore Workouts Each Band is Made by Layering a Continuous Sheet of Natural Rubber Latex which gives the Band Added Strength and Durability. Pro Elite have more layers than the Basic Series, but the same thickness.