Specification:

1. Material: Mineral + Plastic
2. Size: 8inch
3. Function: Use with air pumps and trachea, more bubbles
4. Color: As picture show

Instructions for use:

1. Please soak in water 15 minutes before using this product
2. When long-term using, if dirt blockage, you can clean to repeated use when the bubble is reducing
3. Need to use with air pump and trachea

Package content:

1pcs * Fish Tank Air Bubble Air Stone Bars