We use for Packing of ceramic and glass tubes tubes cardboard tubes (seamless or not it doesn't matter) in lengths of 76mm, 71mm, 56mm and 31mm. The inner diameter is about 100mm and the thicknes is about 6mm. Is it possible for you to offer 1/2 container cif Rotterdam or do you need moor details ? Canyou suply also protective angles and paper tubes (mini containers) for packing small flasks, tee etc ? I am looking forward to your reply. best regards John