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Amazon.co.jp: 19.3 x 33.7 x 11.3mm Ferrite Ring Toroid Iron Powder Toroid Core Black Gray : DIY, Tools & Garden
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Amazon.com: Aexit 2 Pieces Passive Components Green Iron Toroid Ferrite Core 1.2in x 0.7in Ferrites x 0.5in : Industrial & Scientific
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Bettomshin 5Pcs Toroid Core Ferrite Choke Iron Powder Inductor Ferrite Ring 27.2x44.5x16.5mm,Light Green and Blue : Amazon.co.uk: Business, Industry & Science
5pcs T37-6/T50-6/T37-2/ T-30-2 Iron Powder Cores 9.5*5.2*3.3mm Iron Dust Core Ferrite Toroid Core Coating - AliExpress
uxcell Toroid Core, Ferrite Chokes Ring Iron Powder Inductor Ferrite Rings, Yellow White 13pcs, 8.2 x 15.5 x 6.2mm: Amazon.com: Industrial & Scientific
AEcreative T200-2 ferrite Iron Powder core toroid for Amateur ham HF Band balun UNUN Tuner Type 2 red 1.5KW : Amazon.ca: Electronics
Amazon.co.jp: uxcell Ferrite Core, Toroidal Transformer, Magnetic Core, Iron Core, 1 Pack, Green : DIY, Tools & Garden