CordGuard Universal Wrap On Cable Wire Saver Protector Strain Relief, Set of 4 Strain relief prevents the most common type of damage to cables, by protecting the interface between the cable and the device. Cable savers prevent destructive strain where the charging cable meets the charging plug. Also good for audio cables and headphones. Easy to install by hand, no adhesive or residue, permanently adjustable/removable. Set of 4: Comes with variety of diameters good up to  inch cable. Trimming by user can result in perfect fit. Works with earbuds, headphones, iPod, iPhone, iPad, Samsung Galaxy, as well as most laptops, tablets, and android cell phones. Works great for just about any device with small diameter cord.