MOS Spring   Lightning Cable - MFi, Aluminum Heads, Steel Spring Relief & Exoskeleton Braided Jacket, Deep Grey, v2.0, 3 ft. Anodized aluminum heads not only give added protection to the conductor, it also gives the Spring a classy, high quality look and feel. Metal spring strain relief protects the most vulnerable part of the cable. The MOS Lightning Cable features our special Exoskeleton woven jacket. This unique jacket provides greater protection than anything else weve seen for consumer cables. Besides adding significant protection to the inner conductor, the jacket also makes it almost impossible to tangle the cable. In an unprecedented move, we are offering a lifetime guarantee on our cables! That's right, you won't have to buy a new one every few months anymore. We are so confident that if our cable fails for any reason, we'll send a new one, no questions asked!