GX390 AIR FILTER: Stable and reliable performance, this filter keeps the lawn mower for better performance. AFZE18 AIR FILTER: Easy to install and replace, a direct replacement for the damaged or broken one. AF ZE28 AIR FILTER: Periodic replacement of the filter will improve the cleaning performance of your lawn mower. 13 HP ENGINE: Can be effectively cleaned of dust, to prevent large particles of dust from entering the lawn mower. AFZE18 AIR FILTER: Easy to install and replace, a direct replacement for the damaged or broken one. AF ZE28 AIR FILTER: Periodic replacement of the filter will improve the cleaning performance of your lawn mower. 13 HP ENGINE: Can be effectively cleaned of dust, to prevent large particles of dust from entering the lawn mower. AFZE18 AIR FILTER: AIR GX390: Specially designed to fit Honda GX390 GX340 11 13 HP lawn mower. Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color