You need a 230V-110V (115V is OK too) AC converter. An autotransformer will work, or a step-down transformer, or possibly even an AC-DC-AC converter (the latter might even be the cheaper option these days). The required power is on the bottom label of your roller base; it's probably 30W or so. Verify before purchasing a converter.
Whatever converter you buy, it needs to take 230V AC on the input and output 110 or 115V AC, at the required wattage (plus a decent margin; let's say at least 50%). It's likely that any type will work OK. Technically it will need to be 60Hz AC on the output but I doubt the roller base will have a problem running at 50Hz.