Box of 4 X Filterplus Fibre Bags with 5 layers for high efficiency ( up to 75% longer life compared with paper bags) With 1 x Microfilter To Fit - Bosch Arriva BSG1000 - BSG1999, BSG1400, BSG1500: SIEMENS Smily VS01G000 - VS01G999, VS01G400, VS01G500, VS01511G, VS01G511