This refers to a device that is used to break down cannabis buds to create a fine texture, so it burns evenly for better airflow and trichome exposure. A grinder has two halves with pegs aligned systematically to ensure the plant material is shredded effectively when turned. Grinders come in various types of materials like metal, acrylic, aluminum or wood. They are available in different shapes and sizes with the cylindrical shape being the most common.