We have several new ball casters for small robots available! You can choose from different sizes and ball options. These light-weight ball casters are intended for robots weighing up to a few pounds (the larger ball casters are not made for more weight but rather to allow greater obstacle clearance).
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Pololu Ball Casters with 3/8 Inch Plastic Ball
Pololu Ball Casters with 3/8 Inch Metal Ball
Pololu Ball Casters with 1/2 Inch Plastic Ball
Pololu Ball Casters with 1/2 Inch Metal Ball
Pololu Ball Casters with 3/4 Inch Plastic Ball