General description Brand new and high quality replacement HEPA filter compatible with Bissell 2998, 2999, and 31259 vacuum cleaners. Made of high-strength, environmentally friendly materials, this filter screen helps maintain the cleaning performance of your vacuum while reducing the penetration of dust, pollen, and other allergens into the air you breathe. Technical specifications Material: Plastic Color: As shown Package Contents: 2 x Filter, 4 Sets x Cotton Filter Measurement allowed error: +/- 1-3 cm Usage It is recommended to replace the filter every 1 to 2 months for optimal performance.