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Blend of the 2012 vintage: 65% Pinot Noir, 35% Chardonnay.
21 crus: Mainly A˙ & Verzenay for the Pinot Noir, Le Mesnil-sur-Oger & Oiry for the Chardonnay. Fermented entirely in barrels.
At Bollinger, only very high quality harvests become a vintage: the exceptional 2012 vintage led to Bollinger creating expressive wines that were simultaneously full, fresh and complex.
Maturation: Sealed with a natural cork & cellar aged for more than twice the time required by the appellation.
Dosage: Moderate, 8 grammes per litre”
For “pro” input you might want to visit
https://www.vintus.com/wines/la-grande-annee/champagne-bollinger-la-grande-annee-2012/ , the U.S. Importer’s site, or check wine-searcher’s Vendors & Reviews pgs. 😉