The WHITE Tourna Sampras O dampener is useless
It's so stiff that it provides NO useful dampening at all.
Ping! Ping! Ping! It's like having no dampener at all.
It's nothing like the red or black Sampras O damp which are good (particularly the softer red one).
Tourna need to sort out their manufacturing because someone's put the wrong mixture into the machine at the factory.