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
Yasaka fuson is a tensor rubber from yasaka that is a pretty good looping, offensive type rubber, but it is pretty hard to control. The sponge is hard and very elastic, which allows for devastating speed. The topsheet is not terribly tacky, but it is still pretty tacky, so you should have no problem making much spin on your loops, chops, etc. The rubber was AWESOme for regular looping, and counterlooping, you could make extremely fast, powerful shots, but it was hard to high arc loop since the throw angle is not that high. the rubber also has a very nice sound, sound like speed glued rubber. Overall, i think the rubber's pretty good, but maybe not qutie worth 40 dollars.