Specification Brand : uxcell BulletPoint1 : Product Name: Ferrite Cores; Material: Ferroferric Oxide; Model: T80-26B BulletPoint2 : Inner Diameter: 12mm / 0.47"; Outer Diameter: 20.5mm / 0.81" BulletPoint3 : Height: 9.8mm / 0.39"; Total Size: 9.8 x 20.5mm / 0.39" x 0.81" (H*D) BulletPoint4 : Color: Yellow, White; Net Weight: 109g BulletPoint5 : Size: 8pcs 12 x 20.5 x 9.8mm; Package Content: 8pcs x Ferrite Ring Toroid core iron Color : Yellow White 8pcs ItemName : uxcell 8pcs 12 x 20.5 x 9.8mm Ferrite Chokes Ring Iron Powder Toroid Cores Yellow White ItemPackageDimensions_Height : 18.7 centimeters ItemPackageDimensions_Length : 5.5 centimeters ItemPackageDimensions_Width : 12.8 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : electronic-component-ferrites Manufacturer : uxcell Material : iron ModelNumber : a18070600ux0029 NumberOfItems : 2 PartNumber : a18070600ux0037 ProductDescription : This is a ferrite ring, not a magnet. It has no magnetism. Iron powder core is generally stored near signals of place. It has the characteristics of isolating eddy current, low permeability and restraining interference. Used widely in power transformers, current transducers, instrument transformers, inductors, chokes, ballasts, voltage stabilizers and regulators, welding transformers, broad band transformers, filters, etc.