1 roll 70mm/44mm PVC Heat Shrink Tubing Wrap Black &1 pcs PVC Heat Shrink Tubing Wrap The shrink wrap is for covering your custom battery packs as well as other products For the best result use Hot Air but if there is not Hot Air available you can use a hair dryer to evenly heat up the wrap to shrink until it is tightly wrapped around the battery pack. It's approx 0.1mm thick with approx. 2:1 shrink ratio. Shrinking rate: cross section: 48% +/-5; longitudinal: 15% +/-3 Shrinking temperature: 80 Celsius Material: PVC Color: Black PVC Heat Shrink Tubing: Flat Width: 70mm/2.8 inch Round Diameter: 44mm/1.8 inch Thickness: 0.1mm Total Length: 2m/6.5ft Shrink Temperature: 80 Celsius Shrinking Rate: 48% Fit for: for 4 x Pack 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 4x18650 battery square packaging, 3x18650 in parallel packaging, and AA Battery pack. The Battery is not included. Heat Shrinkable Battery Cover: Flame Retardant Length:2m Flattening Width: 120mm (diameter of about 76.39mm) Package Contents: 1 roll x PVC Heat Shrink Tubing 1 x Heat Shrinkable Battery Cover Only the above package content, other products are not included. Note: Light 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. Heat Shrink Tubing Heat Shrink Tube Wrap 2M Battery Heat Shrink Wrap