. . . "Teflon-coated bullets, sometimes colloquially known as \"cop killer bullets\", are bullets that have been covered with a coating of polytetrafluoroethylene."@en . "Teflon-coated bullets, sometimes colloquially known as \"cop killer bullets\", are bullets that have been covered with a coating of polytetrafluoroethylene."@en . "Teflon-coated bullet"@en . .