PRECISION CRAFTSMANSHIP AND FINE MATERIAL: CNC machined from solid metal to ensure perfect balance and robustness: Titanium stem circled by a Brass collar; Silicon Nitride Ceramic tip provides exceptional wear resistance for long term use; knurled upper top body for better grip and faster spins; length of the grip is about 0.55" so if you have a big hand it will be easy for you to spin. LONG SPINNING TIME: A skilled adult could easily spin it for 5-8 minutes on a concave glass; if you are good at spinning then 10 minutes is possible. Looks beautifully even if just place at table.