["Feature:r Core iron powder is stored near place signsr It has parasitic current insulation, low permeability and constant magnetic characteristicsr Stable and reliable performance and durable user Used in power for transformers, current transducers, measurement for transformers, inductors, chokes, reactors, voltage stabilizers and regulators, welding for transformers, broad band for transformers, filters etc.r r newr Model: T50-26r Material: Ironr Color: Yellow, Whiter External Diameter: approx. 13mm/0.51"r Inside Diameter: approx. 7.5mm/0.295"r Thickness: approx. 5mm/0.2"r Circumference: approx. 3.19 cmr Area: approx. 0.112cmr Volume: 0.358 cmr Inductance Coefficient: 33.0nH/Nr Permeability: 75or Quantity: 50 Pcs/1 Setr r Note:r Please allow 0-3mm error due to manual measurement. pls make sure you do not mind before you bidr Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!r r No Retail Packager Package Includes:r 50 x Toroid Ferrite Cores"]