[Premium Material] The faucet aerator is made of ABS plastic,which is easy to install and durable. Plastic vents are more durable than metal grille vents because they won't rust. [Splash Resistant] By mixing the water flow with air,it creates a lot of air bubbles,which makes the water flow smoother and less splashing. The filter inside removes most impurities. The water is cleaner. [Water saving] By adding air,the water flow is stable and strong,which increases the flushing power and effectively reduces water consumption. This allows you to save up to 30% water. [Standard Size] You will receive 10 green aerator inserts with 21mm upper outer diameter and 18mm lower outer diameter,with 10 23mm rubber washers (green) and 10 21mm rubber washers (grey) ). [Wide scope of application]Suitable compatible all places where water saving and filtration is needed,repairing faucets with low water flow or damaged aerators,no need to compatible the faucet.