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Continue to ChatPololu Ball Caster with 1/2 Metal Ball https://avelectronics.cc/producto/pololu-ball-caster-with-1-2%e2%80%b3-metal-ball/
Pololu Ball Caster with 1/2 Metal Ball https://avelectronics.cc/producto/pololu-ball-caster-with-1-2%e2%80%b3-metal-ball/