The 2.2" Kannastör® 2 piece Grinder is constructed from hardened food-grade aluminium. Like all Kannastör® 2-piece grinders they feature a specially-designed tooth-set which really fluffs-up the herbal material with less wrist-work. Details: 2.2" 2 piece grinder Durable aluminium construction Knurled grips for secure handling. Limited Lifetime Warranty - All Kannastor® Grinders are backed by a Limited Lifetime Warranty against manufacturer defects, including broken teeth for any reason.