Toroid Core Magnetics 77548-A7 KoolMu OD =1.291" AL=127. 10 pcs for $27.00

Genuine Magnetics Inc Toroidal Core

Black Polyester Finish (A7)

Dimension: OD1.291" x ID 0.791" x HT 0.450" ,  before coating

AL= 127 (nH/T2) +/8%

Initial Permeability = 125u

For use as chokes, inductors, filters, flyback transformers, PFC transformers, pulse transformers, etc up to 1MHz

For Mag Inc product listing:  mag-inc.com/products/powder-cores/kool-mu