If you know an avid tennis player that breaks their strings a lot! Why not help them invest in a tennis stringer. Get tips from the USRSA on how to string rackets. You can also find such videos on Youtube.
FIND OUT HOW TO STRING RACKETS FROM THIS GUY: YULITLE
STRINGERS ON SALE(FREE SHIPPING!): Click on picture for buying options)
Gamma Progression 602 FC
Gamma 6004