This 5mL tapered tissue grinder is constructed with completely interchangeable parts to allow easier cleaning or replacement of damaged mortars. It has a mortar made from Wheaton 33 low extractable borosilicate glass and a PTFE pestle with a stainless steel rod. It is used to homogenize soft tissue such as brain. The stainless steel rod fits power homogenizers. Conforms to USP Type I and ASTM E-438 Type I, Class A requirements. Tissue Grinder Type: Tapered. Grinding Chamber Material: Borosilicate Glass. Pestle Material: PTFE. Rod Material: Stainless Steel. Grinding Chamber Diameter x Length: 13 x 93mm. Overall Length: 220mm. Capacity: 5mL. Wheaton #: 358141.