Windsor 9.840-643.0 micron filter vacuum bags fit Windsor Sensor and Versamatic Plus upright models including the S12, S15, SR12, SR15, SR18, VSP14, VSP18, XP12, XP15, and XP18. The 3-ply construction provides 0.3-micron filtration, and the green locking clip secures the bag at the inlet port. Also known by part numbers 5300 and 86000500. Sold 10 per package.