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X-DREE 85mm/55mm PVC Heat Shrink Tubing Wrap Black 2m for 18650 Battery Pack(Guaina termorestringente in PVC termoretraibile da 85 mm / 55 mm per 2 batterie da 18650 - - Amazon.com
530Pcs 18650 Insulator Ring and 500Pcs (29.5mm10 Colors)18650 FlatFire Retardant PVC Battery Wrap Heat Shrink Tube for 18650 Batterie: Amazon.com: Industrial & Scientific