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.