What is the fine-grained topic of the following text: Sassicaia is a masterful cuvée of the best Cabernet Sauvignon and Cabernet Franc grapes from the vineyards of Castiglioncello, Doccino, Quercione, San Martino, Mandrioli, Sassicaia, and Aianova, all of which are situated on hilly slopes in a subzone of Bolgheri in coastal Western Tuscany. Only return the topic.
Sassicaia wine from specific vineyards in Bolgheri, Tuscany.