FERROXCUBE Ferrite Ring Toroid Core, For: Choke, Current Regulation, Energy Storage, Transformer, 9.5 x 5.4 x 3.4mm

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.