TF-28X16X20. Core Material: ferromagnetic Ni-Zn. Ferrite Properties: smooth edge prevents the risk of cord damage. Ferrite Series: TF. Ferrite type: ring. Internal diameter: 20mm. Lenght: 16mm. Outer Diameter: 28mm. RoHS: yes. Tolerance: ±0.40mm. Original product from manufacturer: Ferrocore. Quantity in stock updated on 12/11/2025, 18:04