Before the speed-blue ban, almost all top professionals prefered to play with harder rubber to which they then applied many layers of speed glue to bring the rubber up to full speed and maximum performance. With DONIC Desto F1-HS, DONIC has adopted a similar principle: they have incorporated a maximum speed-glue effect into a sponge with 50 degree hardness. The built-in speed-glue effect neutralizes the hardness, giving it a softer feel and thereby increasing ball control.
