Hollow core doors usually have hard wood or pine timber frame with sturdy lock blocks on either side of the door. The center of the door is either filled with waste paper, cardboard or honeycomb. This is why these doors are so fragile that a single strike may cause the door to break down or it may give it an ugly hole that can make it look as bad as the blobfish (if you haven’t seen it then Google it and you’ll know what we mean).

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