ITEM NAME:Filter Media Ceramic Biological Rings Aquarium Fish Tank Pond H6D2 Filter Media Ceramic Biological Rings Aquarium Fish Tank Pond H6D2 Fired by high temperature so as to encourage the growth of nitrifying bacteria. Anti corrosion and provide water of the premium quality for your fish tank. No more hesitation, get one now. Color: Brownish red Dimension: 1.6 cm of length x 1.6 cm of dimeter Net weight: 250g Package content :1 bag x Filter media ( 250g ) Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Anti corrosion and provide water of the premium quality for your fish tank. Net weight: 250g. Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.