When you keep fish in your fish tank or in pond in your backyard, you have to realizethat oxygen is one of the most key factors to affect fish's living. So besides a qualified oxygen pump, we recommend you to buy this silicone oxygen pump hose! It's soft but durable in use. It will efficiently transport oxygen into water, increasing dissolved oxygen volume of the water, providing fish with a comfortable and fresh living environment. Features: Very light and soft, professional oxygen pump hose for fish tank Material: Soft silicone, Dimension: 4 x 6mm (Inner diameter and Out diameter) Good elasticity, better than most of peers in market Efficiently transport oxygen into water, increasing dissolved oxygen volume of thewater Any problem, please contact our store without hesitation. Honor to serve you! Specifications: Item name: Oxygen Pump Hose Material: Soft silicone Color: Transparent Dimension: 4 x 6mm (Inner diameter x Out diameter) Length: 10m Weight: Approx 150g There might be some deviation due to manual measurement. Package Information: Package size: 13x 13x 5cm or 5.1x 5.1x 2in Package weight: 151g Package List: 1 x Oxygen Pump Hose 10m Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.