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By certification 
Toroidal inductors is one of the components commonly used in electronic circuits, It is mainly made of copper wire by way of wound into a ring-shaped form on a core which is made of different material like powdered iron or ferrite.
Toroidal Inductors are used in a wide range of applications such as Solar inverter, Automobile, Charging pile, Medical devices, PC power supply, Stereo equipment, Telecommunications, Industrial controls, Refrigeration equipment, Electronic clutches, Air conditioner equipment and many electronic products.
● Brand: QUNKE ELECTRONIC
● Core: Iron powder core and sendust core
● Wire: Enamelled copper wire
● Inductance Range: 1nH to 1H
● Working Frequency Range: 1KHZ-1MHz
● Shape: Circular with base
Application
Ac inductance, output inductance
Power factor correction
Used for output filtering of switching power supply
DC-DC converter, DC peak noise suppression
Anti-electromagnetic interference of vehicle related devices
Anti - electromagnetic interference of microcomputer - controlled home appliances
http://www.transformerinductor.com/
