http://www.all-for-tennis.com/150359/ektelon-string-l/3-set-of-ektelon-lightning-xx-powerfoil-racquetball-string-16-gauge-1-3mm.html YEARLY 2016-10-16 1 http://www.all-for-tennis.com/152793/ektelon-string-l/3-set-of-ektelon-lightning-xx-powerfoil-racquetball-string-16-gauge-1-3mm.html YEARLY 2016-10-29 1