You are looking at the STI Transmission Mount. This is a homogenized mount made from stiffer materials designed to reduce the motion of your transmission under hard acceleration and braking and will provide a more solid feel to your shifter.
Stiffer rubber material construction
Helps reduce the motion of your transmission under hard acceleration, braking, and cornering
Provides a more solid and stable feel of the engine and transmission through the shfter
Ideal for those with modifications that increase the horsepower and torque which would naturally cause more movement
Helps transfer more power to the transmission
Will not fit the automatic transmission