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Air pump accessory for aquariums: air stones made of quartz sand mixture with extra-fine pores - for extra fine air bubbles Simply connect air stone to the air pump (not included), place inside the aquarium No extra weighting: own weight of the air stone keeps it on the ground For fresh and saltwater aquariums: 2 ball shaped air stones Contents: 2 air stones for fine air bubbles, Ø 21 mm