I'm just checking on the safety of these tiles before we buy them. It says they're made out of recycled rubber. Does that include old tires? Thank you!

Our 3/4" Impact Rubber Tiles are very safe and are tested on a regular basis to ensure they are safe. These tiles feature a recycled rubber top that is backed by a high-density EVA foam. The black part of the rubber is made from recycled tires, and the grey or blue flec is made from EPDM.