ITEM NAME:50mm PVC Heat Shrink Tubing Black 5m 16.4ft for 2 x 18650 Battery E3J3 50mm PVC Heat Shrink Tubing Black 5m 16.4ft for 2 x 18650 Battery E3J3 Packaging method of calculation:To find the size you need, measure the widest cross-section circumference of your pack and then divide it by 2 .Use the shrink wrap size at least 5mm (1/5 inch) wider than your half circumference value. This specification pvc heat shrink tubing suit for packaging the 18650 battery..Notice:The Battery is not heated when the tube is full shrinkable.and must not continue heat the tube after it is full shrinkable.The Battery is not included. Material: PVC; Net Weight: 79g Main Color: Black; Flat Width: 50mm/2inch Round Diameter:32mm/1.25inch; Thickness: 0.1mm Total Length: 5m/16.4ft; Shrink Temperature: 80Degrees Celsius Shrinking Rate: 48%; Fit for: for 2 x 18650 Battery Package Content: 1 x PVC Heat Shrink Tubing; Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Notice:The Battery is not heated when the tube is full shrinkable.and must not continue heat the tube after it is full shrinkable.The Battery is not included. Fit for: for 2 x 18650 Battery. Material: PVC;.