Feature:<br /><br />\u25cfCan creates a circle of bubbles that helps keep fish healthy and adds to the beauty of the aquarium.<br />\u25cfIt produces fine bubbles making it efficient in the replacement of oxygen in fish ponds, tanks or hydroponic systems.<br />\u25cfA great way to properly aerate your aquarium.<br />\u25cfIncrease oxygen levels, lower CO2 and raise PH.<br />\u25cfGreat for freshwater, saltwater\/reef aquariums and hydroponic use.<br />\u25cfIt is an important instrument to successfully keep aquatic fish for respiration process.<br />\u25cfDurable, washable and sintered by high temperature,different from other air stones.<br /><br />Product Attributes: <br /><br />Material: Mineral stone,Plastic<br />Color: Gray<br />Quantity: 1 Pcs<br />Total Size: 2 x 4.7cm\/0.79 x 1.85inch(D x H)<br />Stone Size: 2 x 3.1cm\/0.79 x 1.22inch(D x H)<br /><br />Directions for use:<br /><br />1.Connect the air stone with air tube.<br />2.Soak the air stone in the water for 15 minutes before use.<br />3.It's durable and be used for a long time. When it is clogged with dirt or producing bubbles with low quantity, please wash it for re-used.<br /><br />Package Include:<br /><br />1 x Air Bubble Stone<br /> <br />Note:<br /><br />1.Due to the light and screen difference, the item's color may be slightly different from the pictures. Please understand. Make sure you don't mind before you bid.<br />2.Please allow 1-5mm differences due to manual measurement.