About Us: We mainly concentrated on designing, Manufacturing and selling of physics toys. Hope our products can bring you endless pleasure. Best Gift: The top is a very meaningful gift, memories of childhood, precious friendship, you can send it as a gift to your friends or relatives and so on. Durable: The silicon nitride bearing in all of our spinning tops offer superior wear resistance. well made, no scratches, no signs of the machine, perfectly balanced. Knurled Upper Top Body: Knurling on the stem allows for a high-torque rip to develop high RPMs at launch, At the same time easier to spin. Spin Long Time: After practicing, a skilled adult could spin it for 3-8 minutes easily. A perfect gift for every spinning top lover. High Performance: this is a terrific looking, high performance spinning top. Launches easily, settles quickly, and spins Quiet smoothly. High Quality: We inspect and test each top carefully (and violence test was introduced too) to ensure you have a good shopping experience. Medium Size: The difficulty, spin time and balance performance of the medium size are between that of the large size and the small size. Please choose the appropriate size according to your needs and rotating technology. Overall Dimensions: Large Size: 1.34 inch x1.36 inch(Diameter x High); Medium Size: 1.14 inch x1.28 inch(Diameter x High); Small Size: 0.94 inchx 1.13 inch (Diameter x High) Net Weight: Large Size: 1.63oz; Medium Size: 1.02oz; Small Size: 0.66oz Material: 304 stainless steel, silicon nitride ceramic beads Packing List: Large Spinning top x1, Medium spinning top x1, Small spinning top x1