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Description: Item type: Special Sand Bar for Aquarium Air Pump Sizes: 4inches, 6inches, 8inches, 12inches Instructions: 1. Soak the product in water for 15 minutes before use. 2. Long-term use, such as blockage of dirt and reduction of air bubbles, can be taken out and cleaned for repeated use. 3. The air strip of 10cm-30cm length can be used with the air pump of 2W and above.Dear customer: the higher the wattage of the air pump, the better the air output. 4.Use the air strip of 40-60cm in length with the air pump of more than 3W. Features -- Environmental friendly material -- Easy to use Package includes: 1 * Special Sand Bar for Aquarium Air Pump(any other parts are not included) Notes: This product is only air strip without air pump and air pipe.It is necessary to cooperate with air pump and air pipe 1-2mm error might exist due to manual measurements, please kindly understand. The colors deviation might differ due to different monitor settings. We provide you with the best product and service. If you have any problem, please let us know, and we will solve the problem ASAP. Thank you so much.