Our beach stone pieces are created by hand using river rocks that have been washed and polished. The backing of the tiles are made from plastic netting. When you are looking for a small touch of sophistication, use our beach stone tiles under drinks or pillar candles. Please do not expose to excessive heat by using as a trivet or for hot dishes. Please also note that the tiles are not suitable for protecting your furniture from beverage condensation or dripping wax.