Speedster Lightning Cord 3pk, Medium - 20' 8' 4' Bungee Bands for Speed Training Includes a 20ft, 8ft, & 4ft Resistance Cord. Medium Resistance. Features Safety Sleeve Technology to protect tubing from damage and overstretching. Lightning Cords can last 10x's longer than uncovered tubes. Incredible Safety -Our Safety Sleeve protects athletes from potential injury. If you or your organization provide or use tubing, you could be liable. Speedster Training Products are used by athletes, coaches, organizations and teams worldwide. Made in USA. 1 year conditional warranty.