Cali Crusher manufactures all of its grinders in San Diego, Californio with 6061 aerospace-grade aluminum. Their patented Quick Lock System ensures that your grinder is always easy to open but still secure in your pocket, it also eliminates any possibility of cross-threading and ruining your grinder. Cali Crusher is so confident their grinders will stand up to even the toughest use that the teeth are covered by a lifetime warranty!