STAG Table Tennis Balls are made with highest standards. The top quality balls have gone through Veer Test to test sphericity of the balls.
It's measured by rolling the ball down a slight incline onto a horizontal surface and measuring the distance by which it deviates from a straight line as it rolls across the surface. Balls must not deviate by more than 175 mm from the center line.
STAG Three Star Premium Ball:
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The ultimate ball from STAG undergoes various stringent tests.
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I.T.T.F Approved.
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Size 40 mm