JBL ProSilent Aeras Micro S3
"Airstone set
• New: made out of a extra fine pored silica sand mixture for outstanding fine air bubbles (therefore named “Micro”)
• Consisting of 3 colored air-stones.
• Cylindrical shape with large surface.
• 26 x 15 mm effective surface.
• For fresh and salt water.
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JBL Aeras Micro S3