ITEM NAME:25Pcs 4S 18650 battery adhesive paper hollow solid insulator gasket cardbo JR LJ Description: 100% brand new and high quality Material:Insulate paper Size:35cm*10cm(13.78''*3.94'') Color:Red Function: Insulate cell terminals and Ni tape to avoid short-circuit when welding. How to use? Take off each insulation paper from base paper. Put and stick upper hollow adhesive insulation paper on the top of battery positive. Put and stick lower solid adhesive insulation paper on the negative. Then, you can weld Ni tape or Ni-plated steel plate with positive, negative to make battery pack. Package include:1 sheet insulator gasket cardboard(25pcs) Note: 1.Please allow a slight difference between the real item and the pictures due to the difference between monitors. 2.Please allow a slight measurement error. Thanks for your understanding!.Put and stick upper hollow adhesive insulation paper on the top of battery positive. Put and stick lower solid adhesive insulation paper on the negative. Take off each insulation paper from base paper.