Manufactured in polypropylene and polystyrene. Art. No.s 027-301200, 027-401200 and 027-401204 have internal graduations. Art. No.s 027-301213 and 027-301212 are flared at their top for easy pouring and have a special sedimentation base. Art. No.s 027-301200, 027-401200 and 027-301202 have an external rim. All models are suitable for centrifugation.rPS tubes: 7.500g; PP tubes: 15.000g.rExcept Art.No. 027-301212 and 027-301213 to 3.000g.