The Middelburg and Vlissingen Directors' ships all had substantial 8pdr batteries

Amsterdam Directors' ships all had a good 12pdr battery. For 28-gun ships, the armament was often 10-12pdr, 8-8pdr, 6-6pdr, and 2-3pdr guns. The Middelburg and Vlissingen Directors' ships all had a modest 12pdr battery, except for the Witte Lam, which was often Michiel De Ruyter's flagship from later in 1652. The others had either 2 or 4 12pdr guns, although they would usually have either a few 18pdr or 24pdr guns, as well. The rest had either 10, 14, or 18-8pdr guns. They also had a few 6pdrs, and often had 2 or 4-4pdr guns. Sources:

1. Carl Stapel, unpublished manuscript "Directieschepen van Zeeland in 1652", 2006