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1 pc Ferrite Ring Toroid Core Transformer 3.15" 80x44x25mm μ=2500 USSR NOS | eBay
Ferrite Ring Isolator | Ferrite Core Large | Transformer | Emi Filter | Inductors - 1pcs - Aliexpress
Amazon.com: Konohan 20 Pieces Ferrite Bead Clip on Ferrite Core Ferrite Noise Supressor Ferrite Rings RFI EMI Noise Filter Cable Clip for USB Video Data Cable, 0.11/0.19/0.27/0.35/0.51 Inch Inner Diameter, Black : Electronics
AMIDON FT140-61 Ferrite ring core - HF kits
Clip-on Ferrite Ring Core Rfi EMI Noise Suppressor Cable Clip for 3mm/ 5mm/ 7mm/8mm/ 9mm/ 11mm/13mm Diameter Cable, Black - China EMI Ferrite Core, Nizn Ferrite Core | Made-in-China.com
TR 25 15 12 Richco | Richco Ferrite Ring Toroid Core, For: Broadband Transformers, 25.2 x 15.1 x 12mm | 261-8940 | RS Components