1x 140x140mm large dust filter with magnetic edge in Black
1x 140x140mm large dust filter frame for the housing without metallic properties
The dust filter mesh is somewhat flexible and also not very strong magnetic, should not be set to plan the fan. In my case, I have it on the right door for ventilation of the PSU Corsair CC-9011030-WW mid-tower PC case (ATX, 2x 3.5 internal, external 2x 5.25, 2x USB 3.0) mounted black and am since then free of dust. For the price it offers exactly what I expected.
The company also offers a maintenance software they DemciFilter alarm app called. The software you do not need indeed absolutely but a nice gimmick for people who can not remember when they have cleaned the last time the housing.
My conclusion: Good and cheap product that fully meets its purpose and therefore deserves five stars.