The Volcano Acrylic Grinder XL is one of the largest herb grinders available. Boasting solid German engineering by Storz & Bickel, the Volcano Acrylic Grinder XL has an exceptionally large 90mm herb chamber for grinding bigger amounts of dry herb. The high grade plastic design is knurled for added grip, and transparent so you know through every twist the extent to which your load has been ground. The Volcano Acrylic Herb Grinder XL is an essential tool for preparing loose leaf herb for vaporization.