... like metal pipe,resistant to acids,alkali and oil 2) octagonal box with no smell attracting.good fire-resista Name ... : cavity box /octagonal box 1) Thickness:1.5mm2) Specifications: 4" x ... , 200pcs for export cartons . octagonal box , sizes : 4"x4", 100pcs for export cartons, 20pakages for inner packing octagonal box with cavity box