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)
His recent tour of the UV printer factory was super good too. Glad he seems to be recovering from his head injury (he stopped making videos for a while to recover).