One FT240-43 Toroid Ferrite Core Fair-Rite Bran,d AL=1075 plus or minus 20 percent, uH=(AL x Turns squared)/1000 Wideband, Transformers 5 - 400 MHz, Power Transformers 0.5 - 30 MHz, RFI Suppression 5 - 500 MHz, OD = 2.40 inch / 61.0 mm plus or minus 1.30 mm, ID = 1.40 inch / 35.55 mm plus or minus 0.85 mm, Ht = 0.50 inch / 12.7 mm plus or minus 0.50 mm From bulk packaging, not in retail packaging