When Kanae's strings break the gang heads to a tennis supply store.
The store stocks nothing but unusual strings. Which strings will Kanae choose?
If you attach one to your strings, it'll reduce 
the vibrations when you hit the ball.
Si colocas uno en las cuerdas, 
se reducirá la vibración
Colocando nas cordas, vai reduzir
a vibração quando bater na bola.