ISTA Round Bio-Sponge Filter, Rectangle, Black Size:6 in Can be used indoor or

Can be used indoor or outdoor as a cover or mat

It's also ideal for dogs that have a habit of chewing through traditional leashes

Tug-a-Mals come shaped like one of seven different animals—including a frog

STRONG with a two-millimeter wall thickness

ISTA Round Bio-Sponge Filter, Rectangle, Black Size:6 in Can be used indoor orMechanical filtration: Provides excellent filtering effect while oxygenating the water Biological Filtration: Foam material supports the colonization of bacteria Can be used with either an air pump or any external filter Silent operation by reducing air pump noise Easy to install and simple to maintain