Item Descriptions:-Applicability: This battery insulation gasket is suitable for 21700 batteries and is widely used in batteries, lithium battery packs, electronic components, lighting, etc.-Installation dimensions: outer diameter: 20.5mm, inner diameter: 12mm, thickness: 0.2mm.-Material: Made of barley paper, it has good insulation, beautifies the appearance, is moisture-proof, anti-corrosion and dust-proof.-Easy to install: The insulation gasket comes with adhesive on the back and can be installed without other tools.-Package: Includes 200pcs red battery insulation gasket, sufficient quantity for replacement or spare parts as needed.Package:200pcs Red Battery Insulation GasketItem Specifications:Outer diameter:20.5mmInner diameter:12mmThickness:0.2mmMaterial:Barley PaperColor:RedType:Brand:Unbranded/Generic