I was just wondering, what exactly are those fun dangly accessories this guy’s got going on?

detail from “Militia Company of District VIII under the Command of Captain Roelof Bicker” by Bartholomeus van der Heist, 1643. Rijksmuseum, Amsterdam.
And then, just a few rooms away, here’s what was hanging on the wall!
Here’s what they had to say about it: “Hanging from this belt are twelve wooden containers, each with a charge for a single shot. The powder bottles were also called the Twelve Apostles. The muskateer wore the belt across his chest. He kept his lead shots in a separate leather pouch.”
Museum’s inclusion of costume accessories on display for the WIN!