This air stone is quite an aquarium accessory for your fish tank. It can create much bubbles when attached to air pump (not included) and help increasing the livability of fish.<br /><br />Features:<br />Increase the oxygen of your fish tank.<br />It was sintered by high temperature.<br />Easy to wash， durable and reusable.<br />To help the respiration process of your fish.<br />Used with air pump (not included) to create air bubbles.<br />It can make numberous bubbles to create a fantastic scene.<br />Have 3 size for you to choose.<br /><br />Specifications:<br />Color: Gray<br />Material: Fine Sand<br />Item Size:<br />S: 58mm * 12mm (D * H)<br />L: 78mm * 14mm<br />XL: 98mm * 16mm<br />Item Weight: S / L / XL (Optional)<br />S: 67g / 2.37oz<br />L: 126.5g / 4.47oz<br />XL: 233g / 8.22oz<br />Package Size:<br />S: 13.3 * 9 * 1.4cm / 5.24 * 3.54 * 0.55in<br />L: 15 * 10.5 * 1.6cm / 5.9 * 4.13 * 2.32in<br />XL: 16.5 * 12.3 * 1.8cm / 6.5 * 4.84 * 0.71in<br />Package Weight:<br />S: 77g / 2.72oz<br />L: 139.5g / 4.92oz<br />XL: 255g / 9oz<br /><br />Note:<br />Connect the air stone with air pump.<br />Soak it in the water for 15 minutes before use.<br />If there&#39;s no bubble in some part， maybe you should change a higher power air pump.<br />Suitable for inner diameter 3-4mm soft tube.<br /><br />Package List:<br />1 * Air Stone<br><img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/H/H15734L/H15734L-3-96d9.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/H/H15734L/H15734L-2-96d9.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/H/H15734L/H15734L-1-96d9.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/H/H15734L/H15734L-7-96d9.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/H/H15734L/H15734L-6-96d9.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/H/H15734L/H15734L-9-96d9.jpg" /><br>$$<img src="//img.tomtop.com/product/xy/2000/2000/p/gu1/H/H15734L/H15734L-5-96d9.jpg" /><br>