Extraordinary Designer Series Top Coat delivers unparalleled brilliance and luster, thanks to its unique diamond dust formulation. Developed to keep Lacquer colors true and to prevent yellowing. Features OPI's exclusive ProWide Brush. The polish comes in a glass bottle with a black lid/brush. It is 0.5 fluid ounces. The new collections come with an exclusive ProWide Laquer Brush. It is stated to hold more polish, spread more quickly and evenly, and deliver a streak free application. The brush has stacked bristles vs. the regular spaced bristles of other brushes for a more even application. OPI polishes have a great variety of colors. Over 450 different colors are available to satisfy your taste and fantasy. Besides that two times a year (in fall and spring) OPI pulls out new collections that have new colors, grouped thematically. To distinguish different colors and to help you choose a color by your mood the polishes have incredibly funny and catchy names, that relate to the theme of the collection. Suzi Weiss-Fischmann, OPI Executive VP and Artistic Director picks 3 her favorite shades in each collection, which come with matching lipstick and lip liner. Her taste is the one to trust. Note that collection shades are not going to stay for long. Normally they last for about a year. Only some of them, if they prove to be extremely popular, become a part of the OPI Classic. If your favorite color is from one of the collections and it is discontinued, don't get upset. Sometimes the same color may come back under a different name, though it might be, if any, a slight difference.