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This Single Hole Electrical Insulating Adhesive Mat for Battery Cell terminal Insulation is a cardboard paper for 18650/18350 battery insulator. Better protection to avoid short circuits on batteries.Easy peel and stick application. The Outer Ring Diameter is 18mm, whereas the Inner Ring Diameter is 10mm Thickness: 0.25mm. one sheet contains 50 pieces of Battery Insulators Adhesive Paper Rings.