Totally useless and a slogan of the most abusive kind "amliore game speed "..... mouarf, with your fingers all greasy, it sr! in addition, the pad wears out quickly trs.

in fact, why useless? because with a little lemon oil and a cloth, we get the same rsultat for strings while nourishing the key (when the fast freight is not recommended for albeit a some say), what happens to the cheaper (and before emptying a bottle of lemon oil, you really have to go ...).

Briefly, a pure product marketing gotcha.