Tissue Grinder, 15mL, Style "B", Tapered, All Glass. The conical shape of this tissue grinder has a large surface for grinding making it the most efficient style of tissue grinder. Samples are progressively ground to a smaller size as the pestle is turned and lowered into the tube. It is used for tougher tissue such as heart, lung or muscle. Style "B comes without a reservoir and rod style handle for use with an overhead stirrer.