Are you these made out of rubber similar to the normal 4'x6' Horse Stall mats or a different material?

Our 3/4" Portable Stall Mats are made from high-density foam. Since these tiles are made with foam instead of rubber, they are lighter weight but are still durable. They won't be able to handle the super heavy weights without indenting, but if you place any heavy equipment on the tiles, we recommend placing furniture sliders under the feet of the equipment. Also, these interlocking tiles are non-porous which makes them easy to clean and sanitize helping to prevent that 'gym smell' people smell at local gyms.