The account is (100 ducts). Classic selection: 30x1.5mm 30x2.5mm + + + 20x4mm 10x6mm + 6x10mm + 4x13mm. Just cut (rather 1/2 mm less than 1/2 mm ;-) too. I have not tested them. These larger diameters (10 and 13) are supplied flattened (folded in half) to save space.