Jetting Volume: 0.8 L/min, Recommended Air Pump More Than 2 W. Size: 0.57" x 0.95"(D x H)。Fits for 3/16" inner diameter tube. Fine bubbles provide oxygen for fish to breathe, and lower CO2 level. Can be easily driven by Air pumps, suitable for aquarium, fish tank and hydroponics. Comes with 20 Pcs Grey Cylinder Air Stones. Specification: Material: Mineral stone + plastic, Help to keep fish healthy and adds extra beauty to the aquarium It is an important instrument to keep fish respiration.