Shrinking rate: 48%(cross section)and 8%(longitudinal)Heating tool:hot air gunApplicance:used for 18650 Battery square packaging .This specification pvc heat shrink tubing suit for packaging the 4x18650 battery square packaging, 3x18650 in parallel packaging, and AA Battery pack.Our shop also has other pvc heating shrink tube for multiple batteries, details please contact customer service.The Battery is not included.