uxcell 6.6mm x 12mm x 20mm Cylinder Shaped EMI Suppressor Ferrite Core 20Pcs Product Name : Ferrite Core;Fit for Cable Diameter : 6.6mm/ 0.26" Each Size : 6.6 x 12 x 20mm/0.26" x 0.47" x 0.8 (Inner Dia*Outer Dia*H);Color : Black Material : Magnet Net Weight : 140g Package Content : 20Pcs x Ferrite Core