DevExpress sliders are ASPxTrackBar controls.

<dx:ASPxTrackBar Id="Diameter" ClientInstanceName="Diameter" Direction="Normal"
      runat="server" MinValue="100" MaxValue="100000" Width="300"
      PositionStart="30310" />

 
 

The above and the below are markup for the ASPxTrackBar controls I first tried to use here and then gave up on.

<dx:ASPxTrackBar Id="Distance" ClientInstanceName="Distance" Direction="Normal"
      runat="server" MinValue="0.1" MaxValue="40.0" Width="300" Type="Decimal"
      Step="0.1" PositionStart="2.2" />