100Pcs/Set 7/9/11/12.5/15/18cm Quantitative Filter Paper Ashless Circular Funnel Filter Sheet Slow Speed 10-15um
100Pcs/Set 7/9/11/12.5/15/18cm Quantitative Filter Paper Ashless Circular Funnel Filter Sheet Fast Speed 20-25um
100Pcs/Set 7/9/11/12.5/15/18cm Quantitative Filter Paper Ashless Circular Funnel Filter Sheet Medium Speed 15-20um