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import Checkbox from '@material-ui/core/Checkbox';
import CircleChecked from '@material-ui/icons/CheckCircleOutline';
import CircleCheckedFilled from '@material-ui/icons/CheckCircle';
import CircleUnchecked from '@material-ui/icons/RadioButtonUnchecked';
…
<Checkbox
icon={<CircleUnchecked />}
checkedIcon={<CircleChecked />}
…
/>
// or with filled checked icon:
<Checkbox
icon={<CircleUnchecked />}
checkedIcon={<CircleCheckedFilled />}
…
/>