Erin Burnett is a total moron.

She’s holding up spent munitions that the cops were shooting the protestors. - https://hexbear.net/comment/6226974

Might be?: “A sabot (UK: /sæˈboʊ, ˈsæboʊ/, US: /ˈseɪboʊ/) is a supportive device used in firearm/artillery ammunitions to fit/patch around a projectile, such as a bullet/slug or a flechette-like projectile (such as a kinetic energy penetrator), and keep it aligned in the center of the barrel when fired.”

From wikipedia: https://en.m.wikipedia.org/wiki/Sabot_(firearms)