This is a sturdy plastic ball with specialized sponge media held within. All you need to do is place the moss in the containers and the moss will begin to colonize the sponge and soothe the outside of the container. This makes for a great aquascaping or moss-farming piece. You don't even need to grow moss it could be anything! Java fern and Anubis pieces squeezed in the gaps also will grow into the sponge and sprout out and make a cool spectacle for your fishtank with endless possibilities!
