This is the RS Classic Tour Overgrip Perforated by Robin Söderling.
The RS Classic Tour Overgrip has all the abilities you are used to but now with even greater stretch which makes it easier for you to apply your brand new overgrip. The PERFORATED version contains small holes that transfer the sweat from your hands to the underlaying grip faster which keeps your grip firm and usable even in the most humid conditions.
Developed by Robin Söderling for long durability and perfect balance between sticky feel and unmatched absorption. Less sticky than the RS TrueTac.