Borosilicate glass tube, PTFE pestle with stainless steel shaft.

13-425 GPI thread finish, cap has open top and PTFE-faced silicone rubber liner.

Wheaton 33 low extractable borosilicate glass (meets ASTM Type I Class A and USP Type I standards).

Clearance between pestle and mortar: 0,05 to 0,15 mm