This premium herb grinder is constructed from durable aircraft grade aluminum and boasts a sleek, flower-shaped tooth pattern for a uniform grind. A built-in storage jar with an airtight lid and o-ring seal ensures freshness for moisture-sensitive items while on the go. The Ongrok 5 Piece Storage Grinder features a quarter turn locking function and powerful neodymium magnet to securely hold chambers in place until you're ready to use. Additionally, a removable screen allows for easy cleaning and maintenance. At ONGROK, our mission is to "ENHANCE YOUR EXPERIENCE", providing superior service and products. If you ever encounter any issues, contact us online and we will take care of it.