TDK / Epcos B64290L0659X065 Ferrite Toroid, MnZn T65 material coated in blue epoxy, optimum frequency range is 10 to 200kHz.  These are ideal for use as noise or common mode EMI suppressors on cables to reduce interference from low frequency switching supplies. This product is recommended for reducing RF interference to ADSL modems by creating a common mode choke by winding the balanced telephone cable through the core a number of times. Ideal also for use at 137kHz in RF amplifiers as chokes.

Diameter 40mm, Height 16mm Hole Size 24mm, color Blue, ui=5000.

For more information see the TDK T65 Material Data Sheet and the TDK Ferrites and Accessories Application Notes

Similar to Fair-rite 75 material, can be used in most cases to replace Amidon FT140-75  ui=5000

This product is generally available in higher quantity than stocked in around 1 week POA