FERROXCUBE Ferrite Ring Toroid Core 5.5 mm, For: Energy Storage, Choke, Current Regulation, Transformer 8.2 mm ID 14.6

Ferrite cores offered in 4 varieties of different materials.
The models with an external diameter of less than 9 mm are dark grey, regardless of material. For the other diameters, the core is white.
Recommended for various applications such as making transformers, smoothing chokes, current regulators or even energy storage.