1ea 102X65X20mm Ultra Large Transformer ferrite core 4''X2.6''X0.8''Isolator ferrite Ring RF Choke feririte Bead MnZn PC40 1.Model:power transformer ferrite core 2.Name:T1026520,toroidal shape 3.Material: MnZn ZP40,AL:4100nH/N2 4.Size: OD=102mm ID=65mm T=20mm 5.Shipping:fast shipping from stock