Windsor Sensor Replacement Micro Filter fits All Sensor XP, and S Models (25 filters per case) designed by Green Klean® for exact fit and performance as the OEM, at a considerable savings. Green Klean® vacuum bags use the highest quality filter media including Melt-Blown inner liner in order to achieve filtration efficiencies up to 99.9%. Designed specifically for commercial use, they are always equal to, or exceed OEM quality. Better filtration means cleaner air, less dusting, longer secondary filter life, at considerable savings. Maintains suction longer than conventional bags: better suction, less vacuuming. Keeps machines running at peak performance. Removes many indoor allergens, especially in the critical 0.3 to 1 micron range. Replaces OEM# 5301ER and 8.600-522.0