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Type: 18650 lithium battery insulator rings adhesive paper, work perfectly for 18650 batteries. Reliable performance: Good insulation, corrosion resistance, tear resistance and wear resistance. Easy to use: Safe and stable, better protection to avoid battery shorts, easy to peel and paste . Size: Inner ring diameter: approx. 10mm/0.39inch; Outer ring diameter: approx. 17mm/0.67inch. Package includes: 250pcs battery insulators adhesive paper(125pcs red, 125pcs green).