Melos Dark Viola Rosin is one of the world's finest. It doesn't contain chemicals of any kind or fillers like glucose or sugars. Each rosin type is especially designed for that specific instrument and season, softer dark for winter and harder light for summer. Because it is made when we place the order it is always fresh and is 100% handmade. High quality Melos rosin, made of Greek pine-tree colophony, is produced by Sykiotis in Greece.