Butterfly Tenergy 64

Speed: 13.5
Spin: 10.5
Density: 36 Fast attacking version of the TENERGY family.
TENERGY 64 is the fastest attacking rubber of the TENERGY family; the No. 64 being the development code of the pimples used in producing this reversed rubber.
BUTTERFLY High Tension technology has enabled a fast dynamic rubber to be produced by utilizing the innovative SPRING SPONGE.
SPRING SPONGE enables a player to "grip" the ball and "catapult" the return back at high speed and with heavy spin.