With thread, the cheap alternative to toroids. The light hollow balls are very robust and heat-resistant. Even after selective heating to red heat, the annealing colors can be completely polished away. M6 thread at the top for breakout point, M4 thread at the bottom for mounting on a Tesla coil.
Please inquire about other thread sizes M3-M6.
60mm fits Class-E SSTC
150mm fits SSTC-2
Scope of delivery: