The inside of the case: The storage case compatible with Boost XL GB40 jump starter, Boost X GBX45, Boost GB20, or Boost XL GB50 is lined with velvet. The exterior of the case: The storage case compatible with Boost XL GB40 jump starter, Boost X GBX45 jump starter, Boost GB20 jump starter, or Boost XL GB50 is made of nylon and EVA, which provides certain impact resistance and wear resistance.
