Fair-Rite 0431164951 4.9mm 247R Snap-its Cable Core

Fair-Rite Round Snap-on Ferrite Cores - Fair-Rite 0431164951, A snap-fit ferrite core suitable for round cables or bundled wires with diameters up to 4.90mm. Designed to work at lower and broadband frequencies 1 to 300MHz. Fair-Rite 0431164951 4.9mm 247R Snap-its Cable Core

Price: £1.80 from Rapid Online Rapid Electronics Ltd.