Ceramic Door knob Transmitting Type capacitor as in Ameritron Command Heathkit
A nice touch is that the Manuals & Guides point out safety tips right up front.
Item Tag: Ceramic
Ceramic Coil Form 3/4″ Diameter by 5-3/4″ Coil Length 16 turns/inch No Chips
Going with an Unbranded choice can save a bit without sacrificing basic function.