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The ultimate portable grinder, The Grenco Science G card fits almost anywhere and speeds up any smoking process while on the move. No larger than a credit card, this stainless steel grinder can give you a fine powdery flower with shorter, quicker rubbing or a fluffier, larger material with longer deliberate motions. The circular cut grinder edges sit within Grenco's "G" logo and comes in a matching card holder. Sturdy, functional, and portable, the G Card will come in handy in the tightest of spots.