Michael Sanchez has it on his website Superior Violins. I learned about Jade Rosin about 7 years ago, and fell in love with it. When I first started playing the violin, and up until 7 years ago, used dark rosin. But Jade is so much better in so many ways. It’s got a cleaner sound, smoother play, and is all around a better rosin. It doesn’t get dusty like other rosins do. Plus it lasts longer than other rosins.