Amazon.com: Professional Tennis Racket Stringing Machine with Manual Starting Clamp Stringing Pliers and String Tension Gauge - Includes Tennis String Set and String Savers for Precise Threading Work : Sports & Outdoors
Amazon.com : CHICIRIS String Saver, Reduce String Movement Tennis String Saver Widely Used for Squash Rackets (Black) : Sports & Outdoors
String Savers: Another Piece of the Puzzle in Roger Federer's Racket Setup - Perfect Tennis