Acrylic Pyramid Grinder with Magnet. Acrylic grinders like these are great for three reasons: firstly, the pyramid shaped spikes make easy work of even the most stubborn herbs. Secondly, the magnetic pads on both sides of the grinder help ensure that the two halves don’t come apart when you are using it or when it is in your pocket. And last, but by no means least, having a compartment to put your herbs in isn't a bad idea either as it means you don’t need to carry around a separate baggie, whether you keep your herbs in their original state or pre-crumbled it’s safe and ready to go in your stash compartment. Available in various colours, select from the dropdown menu above.