A grinder card is the most portable and convenient smoking accessory in the world. No thicker or larger than a credit card, you can throw one in your wallet and never have to worry about breaking herb down by hand. When you combine this tool with the versatility of a bowl, dugout pipe, or rolling papers, the world is at your fingertips.

1. Hold the card over a flat, clean surface

When you’re using a grinder card, you want to make sure you’re not losing any herb that is ground up with the grinder card, so have a designated area to work with. Rolling trays are ideal, but a table or even a book is better than nothing. Keep the herb between your thumb and pointer finger of your dominant hand, with herb sticking out from the bottom of your two fingers. Use your middle finger to press herb down into the card if necessary. Your other hand should hold the grinder card slightly above the surface and flat. Grate the herb sticking out against the grinder surface like you’re grating cheese. Use a downward force and don’t be afraid to be pushing the herb through the grinder card with your fingers.

2. Continue grating the herb with some downward force

As more herb gets ground up when you use your grinder card, you’re going to need to reposition the herb in your hand so you can continue using the grinder card effectively. The grinder card surface won’t injure you, but without moving the herb to be better positioned can start to wear down on your fingers. Be smart! The more herb that’s shown, the easier it will be to grind it all up. Pick up the bigger chunks that fall and grind them down further.