The Aquarium Trunk Resin Driftwood Betta Log Hollow Tree Trunk Ornament Hideouts Reptile Cave Medium Fish Tank Decor 2Pcs is a great way to add some style to your fish tank. Made of natural resin, this trunk ornament is light and durable. The hollow design makes it easy to fill with fish or other decorations. The top features a flat surface that can be used for displaying purposes.