uxcell Toroid Core, Ferrite Chokes Ring Iron Powder Inductor Ferrite Rings, Light Green Blue 3pcs, 21.3 x 38.8 x 11.2mm: Amazon.com: Industrial & Scientific
Amazon.com: AEcreative T200-2 ferrite Iron Powder core toroid for Amateur ham HF Band balun UNUN Tuner Type 2 red 1.5KW : Electronics
uxcell Toroid Core, Ferrite Chokes Ring Iron Powder Inductor Ferrite Rings, Light Green Blue 10pcs, 21.3 x 38.8 x 11.2mm: Amazon.com: Industrial & Scientific
IIVVERR 50 x 30 x 19mm Ferrite Ring Iron Toroid Core Black for Power Inductor (50 x 30 x 19 mm Anillo de ferrita Iron Toroid Core Black para Power Inductor - - Amazon.com
X-DREE 2pcs 17mm x 11mm x 27mm Tube Toroids Ferrite Ring Core for Inductor(2 pezzi 17 mn x 11 mn x 27 mn Toroidi con nucleo in ferrite per induttore - - Amazon.com
Amazon.com: Fielect 10 Pcs Toroid Core Ferrite Choke Iron Powder Inductor Ferrite Ring 19.8x33x11.1mm,Yellow and White : Office Products