There is no built-in dumbbell type here. It is a custom series registered with ApexCharts.registerSeriesType('dumbbell', { dataType: 'rangeXY', renderItem }). renderItem draws one stem and two circles per datum through the primitive api, and dataType: 'rangeXY' routes the y: [start, end] pair through the range path so the y-axis fits both bounds and the tooltip reads "start - end". Hover a marker to see it.