Scope of delivery: you will receive 10 green tap aerators (2.1 x 1.8 x 1.1 cm), 10 black washers with a diameter of 2 cm. Material: our faucet aerator is made of plastic, sturdy and durable, excellent workmanship, no corrosion, no blockage, no rust, no peculiar smell. Function: Our jet regulator produces a very low and saves water. It provides enough air bubbles to prevent splashing and water erosion, impurities are filtered in the best way, water flow is large and even. Usage: suitable for households, hotels, public facilities and other places, perfect for kitchen sink, faucet or sink faucet, which helps to save water and filter water. Suggestions: Due to different water quality in the environment, it is recommended to directly replace the perlator every 3-6 months. Note: The data is all manual measurement, if there is please allow 1 - 3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received.