HEPA Filter: Mainly acts as dust collector, intercepts large garbage and debris, effectively helps the robot vacuum cleaner collect dust. Main Purpose: A replacement can improve cleaning efficiency and protect the robot. The recommended replacement period is 3-6 months. Main Material: Environmentally friendly materials, soft and durable to use, can help you solve most cleaning problems, easy to install and remove. Color: White + Black Material: Plastic Size: 70 x 95 x 30mm Package Contents: 4 x Filter Elements Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.