Conical bottom blue graduations and white labelling area.DNase-/RNase- and human DNA-free, non-pyrogenic and non-cytotoxic.Good thermal, mechanical and chemical stability. Max. centrifugability:15 ml tube: 4000 x g in swing-out rotor, 15,000 x g in fixed angle rotor.50 ml tube: 3200 x g in swing-out rotor, 9000 x g in fixed angle rotor.50 ml tube with rim: 2800 x g in swing-out rotor, 11,500 x g in fixed angle rotor.