Material: Stainless steel + copper core Color:silver Size: as shown Inner Diameter of Drainage Hole: 34mm-40mm Pop-up drain filter design subverts traditional and inconvenient drainage methods (such as basic plug with chain)! You can switch between the two modes, plug (water storage) and filter (water drainage), just by lightly pressing the top cover. No jewelry, rings, dirt and other things will enter the drain pipe. Just take out the old sink drain stopper and insert the bouncing core. Package Includes: 1Pc * Bathroom Sink Drain Stopper Note: When purchasing, please measure the size at home, so as not to use it after purchase. Please allow 1-5mm differs due to manual measurement. Due to the different display and different light, the picture may not show the actual color of the item. Thanks for your understanding.