JBL ProSilent Aeras Micro S2
"Airstone set
• New: made out of an extra fine pored silica sand mixture for outstanding fine air bubbles (therefore named “Micro”)
• Containing 2 conical aerator stones.
• Diameter approx. 22 mm.
• Weight of stone keeps it on ground without extra weighting.
• For fresh and salt water.
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JBL Aeras Micro S2