Features: brand new and high quality Intake filter media cover for fish tanks, preventing media from entering your filter system. Aquariums intake filter accessories, great for bio-balls, activated-carbon, ceramics and ammonia remover. Great choice for your fish tanks percolator. Traps particles and debris, enhances biological filtration, prevents small pets from entering into filter. Made of high-quality stainless steel, rust resistant, durable, and safe for fish and water. Specifications: Material: Stainless Steel, Plastic Color: Silver Size (Approx.): Metal Body-25x80mm/0.98x3.15 12mm-With Plastic Part Inner Diameter 12mm/0.47in, Without Plastic Part Inner Diameter 20mm/0.79in 16mm-With Plastic Part Inner Diameter 16mm/0.63in, Without Plastic Part Inner Diameter 20mm/0.79in Weight (Approx.): 25g Package Includes: 1 Piece Inflow Aquariums Filter Shrimp Guard (12mm/16mm) note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks!