Superior quality 33 expansion borosilicate clear glass (Type 1, Class A) Uniformly flat bottom for security with inserts; I-D™ vials feature write-on patch with graduations at 0.5, 1.0, and 1.5mL; Total Volume: 2mL; Usable Volume: 1.5mL; Residual Volume: <170µL; 100/Pack; 20 Packs/Case; Manufacturer: Thermo Fisher National Scientific