Butterfly Sriver FX

Sriver FX is the softer version of Sriver, which was the most popular Butterfly rubber untill the 90's. FX means, that the sponge is softer, but the topsheet remains the same. Manufacturing looks good quality. The rubber does not have any spring-sponge or tensor technology. Back in the "old days" of speed gluing, people applied 2-3 layers of VOC glue to tense this rubber. With water based glue this sheet feels pretty slow an an ALL+ blade, it plays like a DEF setup. Still, ideal for children or older player, who like the old style loops. Dwell time is enormous and control is very good. Most of the technical elements can be done with this rubber, but it does not excel in any one of them. Maybe it is suitable for backhand on a faster OFF composite blade. Actually there are other Sriver upgrades G2 and G3, that are designet to be glued with water-based glue.