General description Replacement HEPA filters designed for Philips FC9331, FC9332, and FC8010 vacuum cleaners. Made from high-strength, environmentally friendly materials, these filters help maintain the cleaning performance of your vacuum while reducing the penetration of dust, pollen, and other allergens into the air. Technical specifications Material: Plastic Package Contents: 4 filters, 4 rear filters, 4 cotton filters, 1 cleaning brush Suggested replacement frequency: every 1 to 2 months Measurement allowed error: +/- 1-3 cm