These are the new plugs from Novarossi. Well I say new they've been around about a year. Identified by a 'B' at the end of the part number such as C8TGFB for a.12 engine and either C7TGFB or C8TGFB for a.21 depending on 16 or 25% nitro. The plugs have a wire that's been burnished which is basically a process that highly polishes the wire to remove surface imperfections which can be cause for wire failure during use.