Flat ocean rocks, 30 rock lot. 1 1/2 to 2 1/2 inches approx. flat Long OVAL beach rocks, Great for painting or carving Necklace Pendants. Beautiful flat oval rocks, This makes a great gift! Paint a picture for your loved one and give them a beautiful gift they will always treasure. These come directly from the ocean and are all-natural so you will need to wash them if you are planning on using them in your fish tanks.