The Marley Natural 4 piece Large Grinder is created from gorgeous black walnut. Features 27 anodized Aluminum teeth, a magnetic top, and a removable screen. The polycarbonate window allows for easy viewing, and is shatterproof. 4 piece grinder 27 custom engineered teeth Magnetic top High-grade anodized aluminum components Clear, shatterproof polycarbonate window Removable magnetic collector with stainless steel scraper