The range of ProStore plastic boxes is made from wear-resistant and fully recyclable polypropylene. You can count on the strength of our boxes as they are designed with a double bottom and reinforced sides. The clip-lock clamps firmly secure the lid and keep your contents dust-free and moisture-free. Can be used to organize your office, home, garage, or workspace. All ProStore storage boxes are non-toxic because they are BPA (Bisphenol) free, complying with European food safety standards.