Penn Plax Aerating Action Ornament, Skeleton at the Wheel &ndash; Moving Decoration AIR DRIVEN ORNAMENTS BRING ANIMATION TO YOUR TANK: the real motion air driven ornaments movements provide fun and entertaining action while aerating your tank. SKELETONS WHEEL TURNS WITH THE STEADY STREAM OF BUBBLES: the skeleton steers the wheel while the bubbles provide movement in your tank. PROVIDES MUCH NEEDED AERATION FOR YOUR TANK: bubbles help the skeleton steer the wheel while providing your tank with much needed air. Requires air pump and standard 3/16 tubing (not included). MADE OF FISH SAFE AND DURABLE MATERIAL: the Penn Plax Aerating Skeleton at the Wheel is made from a durable plastic resin that is safe for your freshwater and saltwater / marine tank. SHOP PENN PLAX FOR ALL YOUR PETS NEEDS: continue to customize your aquarium with Penn Plax Action Ornaments and other decorations and dcor.