Our activated carbon is made of coconut shell charcoal, and it is safe and non-toxic. it can remove the harmful substance, odor, heavy metal, purify the fish tank water, and improve the water quality. Features: Strong absorption: it can strongly absorb certain harmful substance to achieve the removal efficiency. Multipurpose use: it can remove the harmful substance, odor, heavy metal, purify the fish tank water and improve the water quality. Designed with the net bag: comes with the net bag, which make it easy to purify the fish tank water. High quality: made of the coconut shell charcoal, safe, non-toxic and strong absorption. Healthy environment for fish: the activated carbon ensure the water quality and provides the good environment for your fish . Specifications: Condition: 100% Brand New Material: Activated Carbon Color: Black Style: 3 Net Bags, 7 Net Bags(Optional) Weight: approx. 167~377g/ 5.89~ 13.29oz Package List: 1* Activate Carbon Note: 1. Please allow 0-2cm error due to the manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.