Description: Compatibility: The Overflow Comb is designed specifically for overflow boxes, ensuring a good fit and optimal performanceFunctionality: This Aquarium Comb helps to evenly disperse water flow, preventing aquatic life, aquarium organisms, aquatic plants, and gravel from entering the overflow channelMaterial: Made of quality acrylic material that ensures durability and long-term useDimensions: The product comes in 2 sizes,22.7 or 17.7cm in length (suitable for 23 or 18cm grooves), 5cm in width with a thickness of 4mm - designed to fit perfectly into your overflow boxPackage Includes: Each package comes with 1 set of Overflow Comb, providing everything you need for easy installation and use Specification: Material: Acrylic Size Chart: For 23cm: 22.7cmx5cmx0.4cm or 8.94inchx1.97inchx0.16inch or For18cm:17.7cmx5cmx0.4cm or 6.97inchx1.97inchx0.16inch Package Includes: 1 Set of Aquarium Overflow Comb Note: Please allow slightly errors due to manual measurement and different monitors.