Synthetic bag. Suits Nilfisk models SPRINT GM100, FREESTYLE GM150, GM160 ASTRAL SHUTTLE, GM170 ASTRAL SHUTTLE, GM180 ACTION, ACTION PLUS, ACTION PLUS PETVAC A100, A200, A300, A400, C220, COUPE, COUPE PARQUET, GO SERIES, COMPACT C20, CA 100220,BRAVO SERIES 5 bags per pack+ pre-filter