Joytech 3.93'' (100mm) Diameter Spinning Top Base K9 Crystal Glass Concave Mirror, Great High End Transparent Surface Double Concave Top Accessory DZ04

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• CONCAVE MIRROR ---- The top and bottom is concave, this prevents the top from leaving the base as it spins, and you get a great game experience, and when the top spin on the base, can find the center much faster. FREE REPLACEMENT IF DAMGE WITHIN 6MONTHS.
• RAPID STATIC ---- When your gyro works on this base, it helps the gyro get into a stable and quiet state more quickly, once it settles down, it looks like it's "frozen" motionless in place.
• HIGH QUALITY ---- The base is made of K9 optical glass, smooth surface, no defects, chamfered edges, no burrs to prevent hand scratches. Apply to spinning top.
• EXTEND TOP SPIN TIME ---- Experiments have shown that when the top is working on a smooth surface, it can extend the spin time, reduce bottom friction, and reduce resistance.
• OPTICAL EDUCATION ---- The principle of concave mirror is reflection imaging, has the effect of focusing light source, it demonstrates the law of light reflection. It naturally sparks curiosity. This serves as more than just a base; it represents a fundamental concept that needs to be understood.