100% new high quality Made of high quality materials for durability It is best to replace the spare parts every 2 to 3 months to keep your sweeping robot running at performance. [filter screen replacement] replace the filter screen, start up the machine, reset the purifier, and then it can work normally [applicable model] ac4004, other models can check the size, the same size can be general [product name] filter screen of purifier [filter model] Purple AC4121, black AC4123, white AC4124 [product size]: Ac4124 size: 317 * 291 * 18mm Color: White Material: ABS Package Contents: 1 * Filter elements Only the above package content, other products are not included. Note: Light 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. [applicable model] ac4004, other models can check the size, the same size can be general [filter screen replacement] replace the filter screen, start up the machine, reset the purifier, and then it can work normally Made of high quality materials for durability It is best to replace the spare parts every 2 to 3 months to keep your sweeping robot running at .