1. Features: Flexible double-ended brush made of soft nylon bristles and stainless steel, with a reusable design that allows for easy pushing or pulling. 2. How to use: Clean with mild detergent and warm water, then rinse thoroughly with cool water. Keep the tube as straight as possible and gently move the brush back and forth in short strokes, gradually working further inside. Avoid aggressive use during cleaning. 3. Application: Suitable for cleaning small-diameter pipes, helping to remove accumulated residue and algae in tubing. 4. Product size: Brush head sizes are approximately 0.6x2.4 inches and 1.2x2.4 inches, with a total length of 61 inches. It can be used for cleaning water pumps, filters, pipes, connectors, and other hard-to-reach areas. 5. Wide use: Applicable for aquariums, fish tanks, pet drinking fountains, and home kitchens. 6. Specifications: Material: Metal, Nylon; Color options: Yellow/Blue/White/Black/Transparent/Green; Length (approx.): 155cm/61.02in; Weight: Approx. 65g. 7. Package includes: 1 piece of aquarium filter brush (color selected from Yellow/Blue/White/Black/Transparent/Green). 8. Note: 1. Manual measurement may result in an error of 0-1cm, so please consider this before purchasing. 2. Due to monitor differences, the picture may not exactly match the actual color of the item. Thank you for your understanding.