[Water Saving] faucet aerator can fully mix the water and air flowing through to form a foaming effect, improve the scour force, and reduce water consumption. A faucet with an aerator installed saves about 30% than a faucet without the aerator. [Splash-proof, noise-proof, constant-current] After the water flow is mixed into the air, the faucet aerator become softer and reduce the impact force, it can prevent the water from splashing everywhere when the water is out. [filtration]It is also a kitchen bathroom faucet filter built in , which can filter impurities well and water hygiene and safety. And the sink aerator is suitable for kitchen and bathroom. [Packing List]You receive 20 .5 faucet aerators for kitchen bathroom sink aerators replacement and 4 wrenches. According to the different water quality in the area, for your water sanitation and safety, it is recommended to replace the aerator directly every 3-6 months. Colour:gray+blue Material:plastic Size:18.5mm x 11.5mm Package Contents: 20 x 18.5mm faucet aerators 4 x 18.5mm wrenches Important Note Please check the diameter of your faucet before ordering to that you get the right size aerators Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.