1Zinc Alloy Material: The grinder is made of zinc alloy, which is more sturdy, wear proof and durable, and can grind a variety of hard herbs. 2Magnetic Connection: In pursuit of high standards, we have enhanced this grinder so that the top of the grinder is magnetized to the bottom. 3Strong Teeth and 3 Layers: This grinder has strong and dense teeth inside to quickly grind and crush herbs. The 3 layers grinder gives you finer grinded herbs. 4Ball Shape: The shape of the grinder is a sphere with a unique shape. The rounded appearance makes it feel better in the hand. Increase the fun of grinding. 5Lovely and Practical: This ball grinder is a must have! Get one for yourself or give one as a gift. It has both lovely appearance and practical functions.