With lid, with frosted labelling field. Raised graduations for reading the volume. The lid membrane has a uniform thickness and can be easily pierced by an analyzer. The attached lid seals tightly and is firmly seated, yet reopens easily. The microtubes have a uniform wall thickness and are highly transparent. CE marked according to IVD Directive 98/79 EC. Can be centrifuged at an RCA of up to 20,000 RCF at 20 °C for up to 20 min. Lid membrane diameter: 8 mm; approx. 0.35 mm thick. Outer diameter x H: 11 x 41 mm Available in 1.5 ml, packs of 500 pcs.