HEMATO-CLAD Brand Mylar-Wrapped Hematocrit Tubes - Plain. These hematocrit tubes combine the precision of glass with the protection of a Mylar overwrap to help reduce the chance of contamination due to glass fragments or aerosols. In the event of breakage, the Mylar wrapping helps contain the sample and provides an added layer of protection against cuts from broken glass. Packaging: 5x200/Box.