High-quality material: Made of high-quality brass, brass has strong corrosion resistance, durability, and does not rust. In use, the brass surface will slowly oxidize to form a dense oxide film, the color gradually deepening to become more textured and more durable. Sensory Toys - Small toys to be held in the palm of the hand. hand. Easy to play and portable You can play it at office, home, church, libraries, station and on the way of travel. Suitable for children, teenagers and adults It can be as a best calming material and stress relief toys for Autism, Stress Anxiety, Autism Stim. Perfect Rotation and Balance Performance: Made by CNC lathe precision machining, One-piece molding, sleek and smooth, beautifully shaped. The harder silicon nitride is inlaid on the bottom, strong and durable.With perfect rotation and stability, it can also rotate in a small space without falling. The rotation is quiet without noise. It can be rotated for 2-4 minutes on smooth surfaces such as glass or marble. Feature: 32mm in diameter, 37mm but the rotation time is longer and more stable. As it requires more strength and skill. Beginners need to learn skills, continuously extend the rotation time. Non-slip fine knurling on the top makes it easier to rotate and longer rotation time. For the best players, the spin time may exceed 5 minutes. The perfect entertainment gift and decompression toy: it can be a perfect gift for men, women, teenagers, father, mother and friends , etc. Kill boring time, it can also help adults to reduce stress, quit anxiety, help quit smoking, etc. Pay attention, study hard, and let it grow with him. As a work of art, it is an eye-catcher everywhere.