Coir chips make a wonderful potting medium for orchids, bromeliads and other epiphyte plants. The natural coconut husk chips measure 1/4" x 1/2" and are high in lignin so they last much longer than bark. They have a high water-holding capacity and release water evenly as the mix dries out. Each brick measures 8" x 4" x 2.5" and once rehydrated in water it makes more than a gallon of orchid potting mix. Set of 2.