Vacuum cleaner filter paper Basis Weight:60+/-10gsm Filter paper width (height) available: 100mm-1200mm; Thickness: 0.3mm Diameter of the roll: around 78cm Air permeability at 200Pa: 30 L/m2.s Mullen (bursting strength) >=250kpa Maximum Pore Size 30um Volatile Content 4% bestpaper1(at)hotmail(dot)com