In Yasaka Fusion three different synthetic rubbers are mixed with natural rubber for the outside rubber.
Each three kinds have individual characteristics for : Speed, Spin and Durability
That is the basic technology for Yasaka's new concept "Energy Fusion Rubber".
The sponge fusion also contains a certain level of synthetic rubber, which support a good speed glue effect.
When using Fusion with speed glue you will feel a very elastic and easy playing rubber with a strong sound effect!
Sponge hardness: 38 degrees
Speed: 94
Spin: 91
Control: 77