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The [InnerRadius](/componentone/api/mvc/online-mvc-core/dotnet-api/C1.AspNetCore.Mvc/C1.Web.Mvc.FlexPieBase-1.InnerRadius.html) property can be used to leave a blank inner space in the FlexPie, creating a Donut Pie Chart. The blank space can be used to display additional data.
The following image shows a donut FlexPie.

The following code example demonstrates how to set this property. This example uses the sample created in the Quick Start section.
<c1-flex-pie binding-name="Country" binding="Sales" inner-radius="0.4f">
</c1-flex-pie>