GenScript supplies 2.5 ml endotoxin-free tubes (internal diameter 8 mm; external diameter 10 mm; height 50 mm) with plain end made of research-grade glass and aluminum caps. GenScript′s Endotoxin-free tubes can be applied to dilute or aliquot sample with an especial requirement of endotoxin level (< 0.005 EU/ml). GenScript Endotoxin-free tubes are provided in encapsulation with pyrogen-free aluminum foil (folded into a package), which sufficiently inhibits the introduction of any contamination, such as RNase/DNase.