Quantity: 2 pieces color: blue Size: Length 30cm material: plastic Product Rising bubbles enhance vital aquarium aeration and water movement, multi-purpose aquarium air stone for decorative and functional bubbles Increase oxygen and reduce carbon dioxide levels. Durable and washable. Sturdy and non-toxic materials are safe for your fish Instructions for Use:1: Please soak this product in water for 15 minutes before use.2: Long-term use, if dirt clogged, air bubbles reduced, it can be taken out and washed repeatedly.3: It can be used with 2W and above air pumps (the larger the wattage of the air pump, the better the air output ). Product Function: Used in conjunction with air pump and air tube pump, more bubbles We greatly value our customers and want you to be completely satisfied with your purchase. If you aren't happy with your shopping experience or product, we urge you to contact us so we can resolve the issue Specification: Condition:100% New Item Type: Aquarium Sand BarMaterial: PVC, Sandstone Optional Size: Large Size Instructions for Use: 1: Please soak this product in water for 15 minutes before use 2: Long-term use, if dirt clogged, air bubbles reduced, it can be taken out and washed repeatedly 3: It can be used with 2W and above air pumps (the larger the wattage of the air pump, the better the air output ) Product Function: Used in conjunction with air pump and air tube pump, more bubbles Package List: 2x Aquarium Sand Bar