Penn Plax Aqua-Mist Bubble Shell Aerator, 3-1/4-Inch BEAUTIFUL DESIGN AND GREAT FUNCTIONALITY: this aerator is a beautifully shaped scallop shell that releases a steady stream of bubbles. MEDIUM SIZED MIST AERATOR: measures at 4.3 inches tall (10 centimeters). SHOP PENN PLAX FOR ALL YOUR AQUARIUM NEEDS: Penn Plax sells a wide variety of Aquarium products; such as tanks, filters, decorations, and much more