The pre-filter is compatible with for Tineco A10/A11 Hero, A10/A11 Master, A10 Dash, PURE ONE S11 series cordless vacuum cleaners. The hollow design of the larger area enables the vacuum cleaner to provide better suction power.A healthier lifestyle No one wants to breathe dirty air at home, if you don't clean your air filter, this will be exactly what you do Replacing the filter helps clean the air in the air purifier, Let you have a healthier lifestyle.Replace the filter elements every 1 to 4 months. According to the frequency of use, it can be replaced with a shorter or longer time.Easy to install so that you can continue cleaning as soon as possible. Just remove the old filter and put the new filter elements in place. Before replacement, please prepare a Phillips screwdriver.Colour grayMaterial plasticsPackage Contents 2 * Vacuum filterOnly the above package content, other products are not included.Note Light shooting 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.