Sure, there is food grade aluminum foil inside.
White kraft paper : Manufactured in 100% pure pulp, environmental and non-toxic, recyclable, of high tenacity and intensity, high bursting strength index, widely used in winding paper tubes, common thickness is 120-300g.
Brown kraft paper : brown color, of high tension, high tearing strength, common thickness is 120-300g.
Black kraft paper : fine and smooth, strong and thick, of high folding strength, and high tension, common thickness is 120-300g.
Art paper : Surface is very smooth and flat, of high whiteness and glossiness, the printing is three-dimensional， color is bright and very nice, widely used in wrapping tubes, common thick is 157g.
Offset paper : Weak scalability, good smoothness and whiteness, tight quality, used in winding paper tube, but it occurs galling, quality is not as good as white kraft paper.