https://alexnld.com/product/5pcs-2m-85mm-pvc-heat-shrink-tubing-shrink-tube-18650-battery-shrink-sleeve-insulation-casing-heat-shrink-tube-85mm/?hilite="970PCS Boxed Tube Type Bare Terminal Plus Small Copper Tube Heat Shrink Tube Combination Tube Type Pliers Pz0.5-16"