Do these have any metal that will scratch a coated concrete floor? Looking for something not made from old tires that has pieces of metal belts that ruin floors.

Our Washer/Dryer Mats are made from the treads of recycled truck tires. This part of the tire does not inherently have any metal, but since these are cut in areas that will also cut down whole tires, metal can find its way into the mix. To ensure that the metal shavings are removed, our rubber flooring is ran through magnets to ensure that all metallic material is removed. This ensures that your Washer/Dryer mat will not scratch up your nice floor.