Wheaton 357542 Glass Dounce Style Tissue Grinder, 7mL Capacity, 13mm OD x 82mm Length, 175mm Overall Length (Case of 2) All glass with loose and tight pestles retains high percentage of cell nuclei and mitochondria in soft tissues or from cell cultures Unit can be autoclaved / sterilized to prevent cross contamination between samples Pestle ball encircled in liquid avoids heat build up by reducing friction Mortar has large reservoir and pouring lip making decanting easy Made from Wheaton 33 low extractable borosilicate glass