General description Replacement Parts Main Brush, Side Brushes, and HEPA Filter for iRobot Roomba J7 and J7+ Robot Vacuum Cleaner. These accessories are brand new, made of high-strength and environmentally friendly materials, ensuring easy installation and optimal cleaning performance. The filter screen effectively reduces the penetration of dust, pollen, and other allergens into the air. Technical specifications Material: Plastic Package Contents: 2 x Rolling Brush 4 x Border Brush 4 x Filter Screens 1 x Cleaning Brush Measurement allowed error: +/- 1-3 cm Usage It is recommended to replace the brushes and filters every 1 to 2 months to maintain optimal performance.