Calibra LT Spin has a medium soft sponge recommended for highly trained attackers and loopers who emphasize tactical spin. You will have outstanding control for touch shots and service return, but when you are attacking you will experience new levels of possibility.
Manufacturer Specifications:
Type: Smooth
Speed: 95/100
Spin: 92/100
Control: 70/100
Hardness: Medium
Sponge Thickness: 1.8,2.0,Max