Vermonster is an American barley wine style beer brewed by the Rock Art Brewery in Morrisville, Vermont.
 This beer was created by Matt Nadeau, the owner of Rock Art Brewery, in celebration of the brewery's 10th anniversary.
 The beer was created with the theme of "Tens" in that it contains 10% ABV, 100 International Bitterness Units, and 110 pounds of malt per barrel.
Kölsch (] ) is a beer brewed in Cologne, Germany.
 It is a clear, top-fermented beer with a bright, straw-yellow hue similar to other beers brewed from mainly Pilsener malt.
The private brewery Heinrich Reissdorf GmbH & Co.
 KG was founded in 1894 by Heinrich Reissdorf in Cologne.
 It produces a top-fermented beer called Reissdorf Kölsch.
Herkenrode Tripel is a Belgian Abbey beer brewed for the Herkenrode Foundation by commercial brewery St. Joseph in Opitter (Bree, Flanders in Belgium).
 It is on the market since July 2009.
 It has an alcohol by volume percentage of 7%.
 In June 2009 the Federation of Belgian Brewers awarded the beer the name and the logo of Recognized Belgian Abbey Beer.
 In the Herkenrode Abbey in Hasselt, which was founded in 1182, beer was brewed until the French Revolution in the brewery of the abbey.
Gorkha Beer (Nepali: गोर्खा बीअर ) is a brand of beer brewed in Nepal.
 It is a premium quality beer, brewed by Gorkha Brewery Ltd. and launched in May 2006.
 The alcohol content is listed in its label to be 5.0% alc/vol.
 It is one of the few beers produced locally in Nepal.
 The name derives from the Gurkha, people of Nepal.
Viru is a 5.0% ABV pilsner-style beer brewed in Estonia.
 It is brewed in the country's second largest city, Tartu, by the A. Le Coq brewery.
 The brand is owned by Baltic Beer Company Ltd (formerly Brand Independence Ltd), based in London, UK, and is brewed under licence in Estonia.
 A. Le Coq is the second largest brewery in Estonia, with a market share of 36.8% in 2005.
Břevnov Monastery (Czech: "Břevnovský klášter" , German: "Stift Breunau" ) is a Benedictine archabbey in the Břevnov district of Prague, Czech Republic.
 It was founded by Saint Adalbert, the second Bishop of Prague, in 993 AD with the support of Duke Boleslav II of Bohemia.
 The first Benedictine male monastery in Bohemia, it also has the oldest tradition of beer brewing in the Czech Republic, up to today, the "Břevnovský Benedict" beer is brewed here.
 Beer brewed according to the same recipe and under the supervision of the Břevnov Monastery brewery technologists is produced in South Korea since 2017 under the brand Praha 993.
Wrexham Lager Beer is a brewery and pilsner beer brewed in Wrexham, north-east Wales.
 The brewery has existed since 1881 and is reputed to be the first successful lager brewery in the UK.
 The original brewery closed in 2000, but re-opened under new owners in 2011 at a different site.
 The lager is currently sold in two variants: 'Wrexham Lager' (4.2% ABV) available on draught and 'Wrexham Lager Export' (5% abv) which is only available in bottles.
The private brewery Gaffel Becker & Co was founded in 1908 by the Becker Brothers in Cologne.
 It produces a top-fermented beer called Gaffel Kölsch, which is a traditional regional style.
The Licher Privatbrauerei Ihring-Melchior GmbH is a brewery in Lich, Germany.
 With 250 employees, the brewery is the largest private brewery located in Lich.
 "Licher Beer" has been market leader since 1988 in Hessen and is known to be one of the top 20 beers in the German beer market.

Question: The private brewery Gaffel Becker & Co produces a beer brewed from mainly what?
Answer: Pilsener malt