Cholla wood is a natural wood from a cactus plant in the southwest US. Bristlenose and other plecos need some wood in their tank to chew on to help with their digestion. This is the perfect wood. Much better than regular driftwood, this is somewhat softer and has a large surface area for them to chew on. An easy addition to an order of bristlenose or angels. We will send you a 3-4 inch piece (about 1 inch thick) that is already thoroughly boiled to be sanitary and completely sterile so you can drop it right into your tank. Your plecos or snails will love this wood!