This grinder is a 4 piece grinder with a magnetic lid, middle section with holes to let things fall through it, fine mesh screen, and bottom pollen catcher complete with pollen scoop. Both the lid and middle section feature the super functional advanced design square teeth. The teeth have 4 grinding surfaces instead of normal grinders that have 2 giving you a superior grinding surface without over grinding your materials. Each grinder has custom patterned teeth and holes for your materials to fall through making each grinder specifically designed to have optimal function which changes depending on the size of the grinder.