They say you can't reinvent the wheel, but they never said anything about grinders! Our updated 4-piece grinders now feature deeper chambers for your flower and pollen, fully-anodized aircraft grade aluminum interior and a new pollen pick. Upgrade your grind today! The iconic 4-piece 3 chamber grinder has been the staple of the industry for a good reason, it's simply the best design. The 4-piece aluminum grinder allows you to get the most out of your flower with a solid 3 chamber grinder.