All about tennis string savers (What Federer uses on the strings) - YouTube
Unorthodox Stringing: 2014
Tennis String Savers | A Complete Guide to Using, Installing & Buying
Jonathan on Twitter: "The best thing about the Federer Google Glass vid is seeing he still uses 19x16 string pattern + 10 string savers - http://t.co/18IgXourQA" / Twitter