PERFECT FIT - Compatible with iRobot Roomba J & I & E series i7 i7+ i3 i3+ i4 i4+ i6 i6+ i8 i8+ j7 j7+ E5 E6 E7 Robot Vacuum Cleaner.This set works just as well as the others, precise fit and easy installation. PREMIUM MATERIAL - Products are made from high-strength and environmentally friendly materials to ensure optimal performance and a healthier lifestyle. HIGHLY EFFICIENT TECHNOLOGY - Unique multi-surface double rubber Brushes do not get tangled with pet hair.Brushes adjust and bend to keep in constant contact with carpets and hard floors. EASY TO CLEAN AND REPLACE - Clean and replace the roller brush regularly to improve suction and performance and extend the life of your robot vacuum cleaner. THE POWERFUL CLEANING FUNCTION - makes household cleaning more time-saving and labor-saving.It is suitable for a variety of floors such as ceramic tiles, marble and wooden floors.products are not included.The measurement allowed error is +/- 1-3cm.