·With conical bottoms ·With flat-top or plug-seal caps ·Plug-seal caps feature double-start thread design to ensure leak-resistant seal—ideal for working with hazardous or pathogenic materials ·Flat-top caps seal the tube with a tapered rim design—caps can be secured or removed with a single turn ·Molded graduations on conical portion of tube run from 0 to 1mL in 0.1mL subdivisions ·Remaining graduations are printed in black from 1 to 15mL in 0.5mL increments ·Tubes also include large white marking spot for easy labeling ·Sterile and packaged in a bulk pack (sleeve) or a convenient recyclable polyfoam rack