The table top is made of durable, tempered glass up top. Adjustable feet for stability on uneven ground. Silicone pads that prevent the countertop from sliding over the massive metal frame made of 20 mm thick profiles. 8 mm thick. The 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.