Zoo Meds Repti Bark is made from the bark of fir trees. The perfect substrate for humidity loving reptiles due to its ability to absorb moisture and then release it into the terrarium. In addition, the smaller chips provide better moisture retention while preventing live food from hiding in your substrate. Naturally decorative, Repti Bark provides your terrarium with that tropical rainforest look. Repti Bark is washable and re-useable. Allows natural digging and burrowing activity. Absorbent. Pulls icky waste away from your animal. Re-usable and super easy to maintain. All you have to do is soak in hot water every 2 to 3 months for fresh, clean bark. (ReptiBark should be replaced at least once a year)