Out of stock EDX By Endurance 3 Piece Resistance Toning Set EBE-R3PK-BLK EDX by Endurance brand Material Natural Rubber. Color Black. Resistance style. Available in various colors: black, pink. You want a set that provides total body conditioning for your upper body, lower body, and core, then the EDX by Endurance Resistance Toning Set is just what you need. Material: tubular latex rubber. Perfect for: strength training and physical therapy. Resistance Levels: 1 Light Resistance Loop – 25lbs, 1 Medium Resistance. Loop – 25lbs, 1 Heavy Resistance Loop – 30lbs.