These American Fire Glass AFG-FBL-MB-6-B Lite Stone Balls boast a modern, minimalist design to create a neat, uncluttered look for your gas fire pit or fireplace. Available in 4” uniform sets & mixed sets, both types are offered in 4 colors and 1 designer mix. Lite Stone Balls are not designed to be used without proper media and must be used with small lava rock as a base layer.