"Yomega X-Brain - The X-Brain contains a centrifugal 4-way clutch system that opens on the down swing for long smooth spins. As spin time slows, the clutches engage and the yoyo comes back to the hand automatically. The Yomega X-Brain is absolutely perfect for beginners, kids, collectors, or anyone looking to purchase a great stress reliever. The X-Brain's Anatomy: The X-Brain is made of durable polycarbonate, features an automatic 4-way clutch mechanism and low friction plastic bearing that deliver long spins and automatic returns. This yoyo comes in an assortment of bright translucent colors and contains a modular design, making it easy for players to unscrew the halves to untangle string knots or apply lubrication to plastic bearing. The X-Brain also features a see-through cap on one side that enables players to see how the 4-way clutch mechanism works. The X-Brain yo yo weighs 59 grams with a 2.5 mm gap width. The width of the yo yo is 35.7 mm and the diameter is 58.7 mm.