The coffee table set is made of high-quality materials. Steel, shiny bases with adjustable feet are another advantage, directed to the individual expectations and needs of our customers. In order to ensure maximum stability, the tops are additionally placed on massive silicone pads that prevent them from sliding. The black marks on the glossy parts are remnants of polishing paste used to achieve the shine. To remove the dirt use a microfiber cloth and a gentle detergent. Slight bends in the metal structure are not a defect but rather a characteristic that occurs during the welding process.