Celebrate every day like it's a special occasion with these Birthday Cake Grinders! Each style stands four layers tall and is made from sturdy aluminum material with sharp diamond-shaped cutting teeth. The ground herb is deposited in the center storage chamber for easy access. In the base of the grinder, kief and terp crystals that fall through the sifting screen collect in the pollen chamber for future use. These grinders provide you with fluffy ground herb, perfect for packing bowls or rolling joints while you savor an ever-sweet smoke sesh!