These are fairly typical little cylindrical aerators that disperse the air from your air pump into streams of tiny bubbles. I thought the price was right and the quality was absolutely perfect. The nozzles were securely fastened to the stone and the nozzle fit was the standard air hose. I placed my stones under rocks and gravel so color doesn't matter, but if you don't they will be a nice dark blue. No complaints, and with a large pack I have plenty of air stones to work with. If I ever need to buy more I would buy this product again.
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