What do they call it in the wine business Private Reserve That's exactly what you're getting in this 50g jar the best quality grease Shimano uses. Anything branded Dura Ace that has ball bearings is packed in this exact grease. It's as slick as the yellow line in a rainy summertime criterium. Shimano is very, very careful with the Dura Ace brand. Nothing is called Dura Ace unless Shimano fervently believes in its excellence. It might just be grease here, but the fact Shimano chooses to call it Dura Ace is an indisputable testament to its quality.