PRODUCT TYPE: 26650 lithium battery insulator ring, highland barley paper with adhesive backing Size: Outer ring diameter: Φ26mm(1"). Inner ring diameter: Φ14mm(0.55"). Thickness: 0.2mm. ADVANTAGES: Enhance the safety of your 26650 lithium batteries with our insulator rings. Waterproof, Heat-resistant, Crafted from highland barley paper with adhesive backing. Easy to peel and paste. ADVANTAGES: Battery insulator rings offer good insulation, wear, corrosion, and tear resistance. Specifically designed for 26650 batteries. prevent short circuits. PACKAGE INCLUDES: 216PCS 26650 lithium battery insulation ring. SPECIFICATION: Size: Outer ring diameter: Φ26mm(1"). Inner ring diameter: Φ14mm(0.55"). Thickness: 0.2mm. Note: Before using the insulating paper, make sure the surface is clean, dry and free of grease.