Constructed from aircraft grade aluminum, this grinder is lightweight yet still able to stand wear and tear, as the durable aluminum acts a protective for the grinder. At just 45mm, this petite grinder is perfect for travel as it fits comfortably in both the hand or pocket. The 4pc Space Case Grinder Small Magnet 45mm has magnet pieces in the grinder that keeps it snapped shut, staying compact and protecting your dry herb. The 4pc Space Case Grinder Small Magnet 45mm, also has razor sharp teeth that will grind any material thrown at it with ease. When the herbal blend is grinded to a fine consistency, the dry herb will drop through to the second chamber while the pollen falls onto the stainless-steel screen at the bottom chamber for easy collection. Durable, convenient and easy to use the 4pc Space Case Grinder Small Magnet 45mm is the perfect accessory that every vaper needs in their collection.