Features: 1. PREMIUM MATERIAL: Made of high quality plastic material, solid and durable to use. 2. PRACTICAL TOOL: Perfect for cleaning undesired protein colloid of fish tank, provide a fresh and healthy environment for fish to breathe. 3. EASY TO USE: Easy to use, it should be equipped with a air pump, filter protein colloid, organic particles and other harmful heavy metal materials from the water, fast and effective. 4. CONVENIENT & PRACTICAL: Two different size for choosing, suitable for most fish tank, convenient and practical. 5. MAIN FUNCTION: Helps improve exchange and keep your aquarium water clean and clear. Specifications: 1. Material: plastic Caution: 1. Pleasec clean the filter first before you put them into your aquarium.