6.6mm x 12mm x 20mm Cylinder Shaped EMI Suppressor Ferrite Core 20Pcs Selling Unit: 20 x Ferrite Core Type: Wire & Cable Staples Features: for 6.6mm Dia Cable Size (in.): 6.6 x 12 x 20mm/0.26 x 0.47 x 0.8 (Inner Dia*Out Color/Finish: Black Material: Magnet