One 100% Organic Coconut Chip brick (8 x 4 x 1.8-inch) expands to 1.6 gallons of coconut substrate. The perfect size for houseplant repotting projects, and also makes a great substrate for reptile keepers. When ready to use, just add water! Great for improving drainage & soil aeration, our coco chips can be used on their own, as a soil amendment, or as a component of homemade potting mixes.