Look for backer rod at Home Depot, Lowes etc. Its a round foam for filling crack before caulking. You can cut it to length, shape the tip to a point with heat and then use spray on black Plasti-dip to color it. The foam is a gray color already. It is very lightweight as well.
This is what alot of Predator costumers use. Here's a mask I made using it.
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