High quality material: copper shell + stainless steel inner core + ABS plastic, durable, easy to install, fine mesh filter effect is good, can maintain stable and constant water flow, not splashing water. Standard sizes: Top OD 23.6mm/0.92", Bottom OD 12mm/0.47", most standard 24mm universal faucets. Application: Suitable for installing and replacing faucets faucets in homes, hotels, public facilities and other places, to save and filter water. Function: Reduces the impact of water and prevents water splashes by generating a lot of air bubbles, the filter inside can filter out most impurities. Package Included: One bag comes with 12 pcs faucet aerators, enough for your different needs such as home, hotel, utility faucets. We only sell faucet aerators, not other items in the picture. Due to the differences between different monitors , the pictures may not reflect the actual color of the item. Due to manual measurement, please allow slight errors in size.