NEW WWE THE ROCK SHAKER CUP THE ONLY WWE DWAYNE ‘THE ROCK’ JOHNSON PERFORMA™ PERFECTSHAKER CUP IS HERE. WHAT MAKES THE PERFECTSHAKER SO PERFECT? Leak Free Guarantee All PERFORMA™ shaker cups (including our Dwayne ‘The Rock’ Johnson shaker cup), are guaranteed leak free. We’ve spent months perfecting our design to ensure you can trust your shaker cup in your gym bag. Shatter Resistant The perfect shaker cup needs to be shatter resistant. We understand life can get rough but we want your PERFORMA™ to last and keep plastic out of landfills.