The design of this coil type is similar to the air core coil, except that it contains a soft, special high quality ferrite core. The magnetisation curve is linear at small to medium volumes. This coil type is suitable to confined conditions where large air core coil won't have enough space. Conductor: 99.99% Oxygen-free Copper, Insulation: Type V Enamel, Bobbin material: AB, Dimensional stability (Shape retention): 85oC, Inductance values tested at: 1 kHz/25oC, Inductance tolerance: +/-5%, Connecting leads: 10/40/50mm long (tinned: 9/35/45mm), Core type: Bobbin style, Core material: Ferrobar Inductors HQ43/45 & 58/56 can be mounted upright or on their side.