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.