KIMBLE® KONTES® DUALL® Tissue Grinder manufactured by DWK Life Science is made of borosilicate glass 3.3. The tube features transparent plastic coating to hold the homogenate if the tube breaks or cracks during motor-driven homogenization. DUALL® combines both conical and cylindrical surfaces on a single pestle and tube. These separate areas perform the dual functions of initial grinding in the conical section and final homogenization in the cylindrical section.